1 files changed, 1712 insertions, 0 deletions
diff --git a/phpBB/includes/sphinxapi.php b/phpBB/includes/sphinxapi.php
new file mode 100644
index 0000000000..6c3b66710c
--- /dev/null
+++ b/phpBB/includes/sphinxapi.php
@@ -0,0 +1,1712 @@
+<?php
+
+//
+// $Id: sphinxapi.php 3087 2012-01-30 23:07:35Z shodan $
+//
+
+//
+// Copyright (c) 2001-2012, Andrew Aksyonoff
+// Copyright (c) 2008-2012, Sphinx Technologies Inc
+// All rights reserved
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License. You should have
+// received a copy of the GPL license along with this program; if you
+// did not, you can find it at http://www.gnu.org/
+//
+
+/////////////////////////////////////////////////////////////////////////////
+// PHP version of Sphinx searchd client (PHP API)
+/////////////////////////////////////////////////////////////////////////////
+
+/// known searchd commands
+define ( "SEARCHD_COMMAND_SEARCH",		0 );
+define ( "SEARCHD_COMMAND_EXCERPT",		1 );
+define ( "SEARCHD_COMMAND_UPDATE",		2 );
+define ( "SEARCHD_COMMAND_KEYWORDS",	3 );
+define ( "SEARCHD_COMMAND_PERSIST",		4 );
+define ( "SEARCHD_COMMAND_STATUS",		5 );
+define ( "SEARCHD_COMMAND_FLUSHATTRS",	7 );
+
+/// current client-side command implementation versions
+define ( "VER_COMMAND_SEARCH",		0x119 );
+define ( "VER_COMMAND_EXCERPT",		0x104 );
+define ( "VER_COMMAND_UPDATE",		0x102 );
+define ( "VER_COMMAND_KEYWORDS",	0x100 );
+define ( "VER_COMMAND_STATUS",		0x100 );
+define ( "VER_COMMAND_QUERY",		0x100 );
+define ( "VER_COMMAND_FLUSHATTRS",	0x100 );
+
+/// known searchd status codes
+define ( "SEARCHD_OK",				0 );
+define ( "SEARCHD_ERROR",			1 );
+define ( "SEARCHD_RETRY",			2 );
+define ( "SEARCHD_WARNING",			3 );
+
+/// known match modes
+define ( "SPH_MATCH_ALL",			0 );
+define ( "SPH_MATCH_ANY",			1 );
+define ( "SPH_MATCH_PHRASE",		2 );
+define ( "SPH_MATCH_BOOLEAN",		3 );
+define ( "SPH_MATCH_EXTENDED",		4 );
+define ( "SPH_MATCH_FULLSCAN",		5 );
+define ( "SPH_MATCH_EXTENDED2",		6 );	// extended engine V2 (TEMPORARY, WILL BE REMOVED)
+
+/// known ranking modes (ext2 only)
+define ( "SPH_RANK_PROXIMITY_BM25",	0 );	///< default mode, phrase proximity major factor and BM25 minor one
+define ( "SPH_RANK_BM25",			1 );	///< statistical mode, BM25 ranking only (faster but worse quality)
+define ( "SPH_RANK_NONE",			2 );	///< no ranking, all matches get a weight of 1
+define ( "SPH_RANK_WORDCOUNT",		3 );	///< simple word-count weighting, rank is a weighted sum of per-field keyword occurence counts
+define ( "SPH_RANK_PROXIMITY",		4 );
+define ( "SPH_RANK_MATCHANY",		5 );
+define ( "SPH_RANK_FIELDMASK",		6 );
+define ( "SPH_RANK_SPH04",			7 );
+define ( "SPH_RANK_EXPR",			8 );
+define ( "SPH_RANK_TOTAL",			9 );
+
+/// known sort modes
+define ( "SPH_SORT_RELEVANCE",		0 );
+define ( "SPH_SORT_ATTR_DESC",		1 );
+define ( "SPH_SORT_ATTR_ASC",		2 );
+define ( "SPH_SORT_TIME_SEGMENTS", 	3 );
+define ( "SPH_SORT_EXTENDED", 		4 );
+define ( "SPH_SORT_EXPR", 			5 );
+
+/// known filter types
+define ( "SPH_FILTER_VALUES",		0 );
+define ( "SPH_FILTER_RANGE",		1 );
+define ( "SPH_FILTER_FLOATRANGE",	2 );
+
+/// known attribute types
+define ( "SPH_ATTR_INTEGER",		1 );
+define ( "SPH_ATTR_TIMESTAMP",		2 );
+define ( "SPH_ATTR_ORDINAL",		3 );
+define ( "SPH_ATTR_BOOL",			4 );
+define ( "SPH_ATTR_FLOAT",			5 );
+define ( "SPH_ATTR_BIGINT",			6 );
+define ( "SPH_ATTR_STRING",			7 );
+define ( "SPH_ATTR_MULTI",			0x40000001 );
+define ( "SPH_ATTR_MULTI64",			0x40000002 );
+
+/// known grouping functions
+define ( "SPH_GROUPBY_DAY",			0 );
+define ( "SPH_GROUPBY_WEEK",		1 );
+define ( "SPH_GROUPBY_MONTH",		2 );
+define ( "SPH_GROUPBY_YEAR",		3 );
+define ( "SPH_GROUPBY_ATTR",		4 );
+define ( "SPH_GROUPBY_ATTRPAIR",	5 );
+
+// important properties of PHP's integers:
+//  - always signed (one bit short of PHP_INT_SIZE)
+//  - conversion from string to int is saturated
+//  - float is double
+//  - div converts arguments to floats
+//  - mod converts arguments to ints
+
+// the packing code below works as follows:
+//  - when we got an int, just pack it
+//    if performance is a problem, this is the branch users should aim for
+//
+//  - otherwise, we got a number in string form
+//    this might be due to different reasons, but we assume that this is
+//    because it didn't fit into PHP int
+//
+//  - factor the string into high and low ints for packing
+//    - if we have bcmath, then it is used
+//    - if we don't, we have to do it manually (this is the fun part)
+//
+//    - x64 branch does factoring using ints
+//    - x32 (ab)uses floats, since we can't fit unsigned 32-bit number into an int
+//
+// unpacking routines are pretty much the same.
+//  - return ints if we can
+//  - otherwise format number into a string
+
+/// pack 64-bit signed
+function sphPackI64 ( $v )
+{
+	assert ( is_numeric($v) );
+	
+	// x64
+	if ( PHP_INT_SIZE>=8 )
+	{
+		$v = (int)$v;
+		return pack ( "NN", $v>>32, $v&0xFFFFFFFF );
+	}
+
+	// x32, int
+	if ( is_int($v) )
+		return pack ( "NN", $v < 0 ? -1 : 0, $v );
+
+	// x32, bcmath	
+	if ( function_exists("bcmul") )
+	{
+		if ( bccomp ( $v, 0 ) == -1 )
+			$v = bcadd ( "18446744073709551616", $v );
+		$h = bcdiv ( $v, "4294967296", 0 );
+		$l = bcmod ( $v, "4294967296" );
+		return pack ( "NN", (float)$h, (float)$l ); // conversion to float is intentional; int would lose 31st bit
+	}
+
+	// x32, no-bcmath
+	$p = max(0, strlen($v) - 13);
+	$lo = abs((float)substr($v, $p));
+	$hi = abs((float)substr($v, 0, $p));
+
+	$m = $lo + $hi*1316134912.0; // (10 ^ 13) % (1 << 32) = 1316134912
+	$q = floor($m/4294967296.0);
+	$l = $m - ($q*4294967296.0);
+	$h = $hi*2328.0 + $q; // (10 ^ 13) / (1 << 32) = 2328
+
+	if ( $v<0 )
+	{
+		if ( $l==0 )
+			$h = 4294967296.0 - $h;
+		else
+		{
+			$h = 4294967295.0 - $h;
+			$l = 4294967296.0 - $l;
+		}
+	}
+	return pack ( "NN", $h, $l );
+}
+
+/// pack 64-bit unsigned
+function sphPackU64 ( $v )
+{
+	assert ( is_numeric($v) );
+	
+	// x64
+	if ( PHP_INT_SIZE>=8 )
+	{
+		assert ( $v>=0 );
+		
+		// x64, int
+		if ( is_int($v) )
+			return pack ( "NN", $v>>32, $v&0xFFFFFFFF );
+						  
+		// x64, bcmath
+		if ( function_exists("bcmul") )
+		{
+			$h = bcdiv ( $v, 4294967296, 0 );
+			$l = bcmod ( $v, 4294967296 );
+			return pack ( "NN", $h, $l );
+		}
+		
+		// x64, no-bcmath
+		$p = max ( 0, strlen($v) - 13 );
+		$lo = (int)substr ( $v, $p );
+		$hi = (int)substr ( $v, 0, $p );
+	
+		$m = $lo + $hi*1316134912;
+		$l = $m % 4294967296;
+		$h = $hi*2328 + (int)($m/4294967296);
+
+		return pack ( "NN", $h, $l );
+	}
+
+	// x32, int
+	if ( is_int($v) )
+		return pack ( "NN", 0, $v );
+	
+	// x32, bcmath
+	if ( function_exists("bcmul") )
+	{
+		$h = bcdiv ( $v, "4294967296", 0 );
+		$l = bcmod ( $v, "4294967296" );
+		return pack ( "NN", (float)$h, (float)$l ); // conversion to float is intentional; int would lose 31st bit
+	}
+
+	// x32, no-bcmath
+	$p = max(0, strlen($v) - 13);
+	$lo = (float)substr($v, $p);
+	$hi = (float)substr($v, 0, $p);
+	
+	$m = $lo + $hi*1316134912.0;
+	$q = floor($m / 4294967296.0);
+	$l = $m - ($q * 4294967296.0);
+	$h = $hi*2328.0 + $q;
+
+	return pack ( "NN", $h, $l );
+}
+
+// unpack 64-bit unsigned
+function sphUnpackU64 ( $v )
+{
+	list ( $hi, $lo ) = array_values ( unpack ( "N*N*", $v ) );
+
+	if ( PHP_INT_SIZE>=8 )
+	{
+		if ( $hi<0 ) $hi += (1<<32); // because php 5.2.2 to 5.2.5 is totally fucked up again
+		if ( $lo<0 ) $lo += (1<<32);
+
+		// x64, int
+		if ( $hi<=2147483647 )
+			return ($hi<<32) + $lo;
+
+		// x64, bcmath
+		if ( function_exists("bcmul") )
+			return bcadd ( $lo, bcmul ( $hi, "4294967296" ) );
+
+		// x64, no-bcmath
+		$C = 100000;
+		$h = ((int)($hi / $C) << 32) + (int)($lo / $C);
+		$l = (($hi % $C) << 32) + ($lo % $C);
+		if ( $l>$C )
+		{
+			$h += (int)($l / $C);
+			$l  = $l % $C;
+		}
+
+		if ( $h==0 )
+			return $l;
+		return sprintf ( "%d%05d", $h, $l );
+	}
+
+	// x32, int
+	if ( $hi==0 )
+	{
+		if ( $lo>0 )
+			return $lo;
+		return sprintf ( "%u", $lo );
+	}
+
+	$hi = sprintf ( "%u", $hi );
+	$lo = sprintf ( "%u", $lo );
+
+	// x32, bcmath
+	if ( function_exists("bcmul") )
+		return bcadd ( $lo, bcmul ( $hi, "4294967296" ) );
+	
+	// x32, no-bcmath
+	$hi = (float)$hi;
+	$lo = (float)$lo;
+	
+	$q = floor($hi/10000000.0);
+	$r = $hi - $q*10000000.0;
+	$m = $lo + $r*4967296.0;
+	$mq = floor($m/10000000.0);
+	$l = $m - $mq*10000000.0;
+	$h = $q*4294967296.0 + $r*429.0 + $mq;
+
+	$h = sprintf ( "%.0f", $h );
+	$l = sprintf ( "%07.0f", $l );
+	if ( $h=="0" )
+		return sprintf( "%.0f", (float)$l );
+	return $h . $l;
+}
+
+// unpack 64-bit signed
+function sphUnpackI64 ( $v )
+{
+	list ( $hi, $lo ) = array_values ( unpack ( "N*N*", $v ) );
+
+	// x64
+	if ( PHP_INT_SIZE>=8 )
+	{
+		if ( $hi<0 ) $hi += (1<<32); // because php 5.2.2 to 5.2.5 is totally fucked up again
+		if ( $lo<0 ) $lo += (1<<32);
+
+		return ($hi<<32) + $lo;
+	}
+
+	// x32, int
+	if ( $hi==0 )
+	{
+		if ( $lo>0 )
+			return $lo;
+		return sprintf ( "%u", $lo );
+	}
+	// x32, int
+	elseif ( $hi==-1 )
+	{
+		if ( $lo<0 )
+			return $lo;
+		return sprintf ( "%.0f", $lo - 4294967296.0 );
+	}
+	
+	$neg = "";
+	$c = 0;
+	if ( $hi<0 )
+	{
+		$hi = ~$hi;
+		$lo = ~$lo;
+		$c = 1;
+		$neg = "-";
+	}	
+
+	$hi = sprintf ( "%u", $hi );
+	$lo = sprintf ( "%u", $lo );
+
+	// x32, bcmath
+	if ( function_exists("bcmul") )
+		return $neg . bcadd ( bcadd ( $lo, bcmul ( $hi, "4294967296" ) ), $c );
+
+	// x32, no-bcmath
+	$hi = (float)$hi;
+	$lo = (float)$lo;
+	
+	$q = floor($hi/10000000.0);
+	$r = $hi - $q*10000000.0;
+	$m = $lo + $r*4967296.0;
+	$mq = floor($m/10000000.0);
+	$l = $m - $mq*10000000.0 + $c;
+	$h = $q*4294967296.0 + $r*429.0 + $mq;
+	if ( $l==10000000 )
+	{
+		$l = 0;
+		$h += 1;
+	}
+
+	$h = sprintf ( "%.0f", $h );
+	$l = sprintf ( "%07.0f", $l );
+	if ( $h=="0" )
+		return $neg . sprintf( "%.0f", (float)$l );
+	return $neg . $h . $l;
+}
+
+
+function sphFixUint ( $value )
+{
+	if ( PHP_INT_SIZE>=8 )
+	{
+		// x64 route, workaround broken unpack() in 5.2.2+
+		if ( $value<0 ) $value += (1<<32);
+		return $value;
+	}
+	else
+	{
+		// x32 route, workaround php signed/unsigned braindamage
+		return sprintf ( "%u", $value );
+	}
+}
+
+
+/// sphinx searchd client class
+class SphinxClient
+{
+	var $_host;			///< searchd host (default is "localhost")
+	var $_port;			///< searchd port (default is 9312)
+	var $_offset;		///< how many records to seek from result-set start (default is 0)
+	var $_limit;		///< how many records to return from result-set starting at offset (default is 20)
+	var $_mode;			///< query matching mode (default is SPH_MATCH_ALL)
+	var $_weights;		///< per-field weights (default is 1 for all fields)
+	var $_sort;			///< match sorting mode (default is SPH_SORT_RELEVANCE)
+	var $_sortby;		///< attribute to sort by (defualt is "")
+	var $_min_id;		///< min ID to match (default is 0, which means no limit)
+	var $_max_id;		///< max ID to match (default is 0, which means no limit)
+	var $_filters;		///< search filters
+	var $_groupby;		///< group-by attribute name
+	var $_groupfunc;	///< group-by function (to pre-process group-by attribute value with)
+	var $_groupsort;	///< group-by sorting clause (to sort groups in result set with)
+	var $_groupdistinct;///< group-by count-distinct attribute
+	var $_maxmatches;	///< max matches to retrieve
+	var $_cutoff;		///< cutoff to stop searching at (default is 0)
+	var $_retrycount;	///< distributed retries count
+	var $_retrydelay;	///< distributed retries delay
+	var $_anchor;		///< geographical anchor point
+	var $_indexweights;	///< per-index weights
+	var $_ranker;		///< ranking mode (default is SPH_RANK_PROXIMITY_BM25)
+	var $_rankexpr;		///< ranking mode expression (for SPH_RANK_EXPR)
+	var $_maxquerytime;	///< max query time, milliseconds (default is 0, do not limit)
+	var $_fieldweights;	///< per-field-name weights
+	var $_overrides;	///< per-query attribute values overrides
+	var $_select;		///< select-list (attributes or expressions, with optional aliases)
+
+	var $_error;		///< last error message
+	var $_warning;		///< last warning message
+	var $_connerror;		///< connection error vs remote error flag
+
+	var $_reqs;			///< requests array for multi-query
+	var $_mbenc;		///< stored mbstring encoding
+	var $_arrayresult;	///< whether $result["matches"] should be a hash or an array
+	var $_timeout;		///< connect timeout
+
+	/////////////////////////////////////////////////////////////////////////////
+	// common stuff
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// create a new client object and fill defaults
+	function SphinxClient ()
+	{
+		// per-client-object settings
+		$this->_host		= "localhost";
+		$this->_port		= 9312;
+		$this->_path		= false;
+		$this->_socket		= false;
+
+		// per-query settings
+		$this->_offset		= 0;
+		$this->_limit		= 20;
+		$this->_mode		= SPH_MATCH_ALL;
+		$this->_weights		= array ();
+		$this->_sort		= SPH_SORT_RELEVANCE;
+		$this->_sortby		= "";
+		$this->_min_id		= 0;
+		$this->_max_id		= 0;
+		$this->_filters		= array ();
+		$this->_groupby		= "";
+		$this->_groupfunc	= SPH_GROUPBY_DAY;
+		$this->_groupsort	= "@group desc";
+		$this->_groupdistinct= "";
+		$this->_maxmatches	= 1000;
+		$this->_cutoff		= 0;
+		$this->_retrycount	= 0;
+		$this->_retrydelay	= 0;
+		$this->_anchor		= array ();
+		$this->_indexweights= array ();
+		$this->_ranker		= SPH_RANK_PROXIMITY_BM25;
+		$this->_rankexpr	= "";
+		$this->_maxquerytime= 0;
+		$this->_fieldweights= array();
+		$this->_overrides 	= array();
+		$this->_select		= "*";
+
+		$this->_error		= ""; // per-reply fields (for single-query case)
+		$this->_warning		= "";
+		$this->_connerror	= false;
+
+		$this->_reqs		= array ();	// requests storage (for multi-query case)
+		$this->_mbenc		= "";
+		$this->_arrayresult	= false;
+		$this->_timeout		= 0;
+	}
+
+	function __destruct()
+	{
+		if ( $this->_socket !== false )
+			fclose ( $this->_socket );
+	}
+
+	/// get last error message (string)
+	function GetLastError ()
+	{
+		return $this->_error;
+	}
+
+	/// get last warning message (string)
+	function GetLastWarning ()
+	{
+		return $this->_warning;
+	}
+
+	/// get last error flag (to tell network connection errors from searchd errors or broken responses)
+	function IsConnectError()
+	{
+		return $this->_connerror;
+	}
+
+	/// set searchd host name (string) and port (integer)
+	function SetServer ( $host, $port = 0 )
+	{
+		assert ( is_string($host) );
+		if ( $host[0] == '/')
+		{
+			$this->_path = 'unix://' . $host;
+			return;
+		}
+		if ( substr ( $host, 0, 7 )=="unix://" )
+		{
+			$this->_path = $host;
+			return;
+		}
+				
+		assert ( is_int($port) );
+		$this->_host = $host;
+		$this->_port = $port;
+		$this->_path = '';
+
+	}
+
+	/// set server connection timeout (0 to remove)
+	function SetConnectTimeout ( $timeout )
+	{
+		assert ( is_numeric($timeout) );
+		$this->_timeout = $timeout;
+	}
+
+
+	function _Send ( $handle, $data, $length )
+	{
+		if ( feof($handle) || fwrite ( $handle, $data, $length ) !== $length )
+		{
+			$this->_error = 'connection unexpectedly closed (timed out?)';
+			$this->_connerror = true;
+			return false;
+		}
+		return true;
+	}
+
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// enter mbstring workaround mode
+	function _MBPush ()
+	{
+		$this->_mbenc = "";
+		if ( ini_get ( "mbstring.func_overload" ) & 2 )
+		{
+			$this->_mbenc = mb_internal_encoding();
+			mb_internal_encoding ( "latin1" );
+		}
+    }
+
+	/// leave mbstring workaround mode
+	function _MBPop ()
+	{
+		if ( $this->_mbenc )
+			mb_internal_encoding ( $this->_mbenc );
+	}
+
+	/// connect to searchd server
+	function _Connect ()
+	{
+		if ( $this->_socket!==false )
+		{
+			// we are in persistent connection mode, so we have a socket
+			// however, need to check whether it's still alive
+			if ( !@feof ( $this->_socket ) )
+				return $this->_socket;
+
+			// force reopen
+			$this->_socket = false;
+		}
+
+		$errno = 0;
+		$errstr = "";
+		$this->_connerror = false;
+
+		if ( $this->_path )
+		{
+			$host = $this->_path;
+			$port = 0;
+		}
+		else
+		{
+			$host = $this->_host;
+			$port = $this->_port;
+		}
+
+		if ( $this->_timeout<=0 )
+			$fp = @fsockopen ( $host, $port, $errno, $errstr );
+		else
+			$fp = @fsockopen ( $host, $port, $errno, $errstr, $this->_timeout );
+		
+		if ( !$fp )
+		{
+			if ( $this->_path )
+				$location = $this->_path;
+			else
+				$location = "{$this->_host}:{$this->_port}";
+			
+			$errstr = trim ( $errstr );
+			$this->_error = "connection to $location failed (errno=$errno, msg=$errstr)";
+			$this->_connerror = true;
+			return false;
+		}
+
+		// send my version
+		// this is a subtle part. we must do it before (!) reading back from searchd.
+		// because otherwise under some conditions (reported on FreeBSD for instance)
+		// TCP stack could throttle write-write-read pattern because of Nagle.
+		if ( !$this->_Send ( $fp, pack ( "N", 1 ), 4 ) )
+		{
+			fclose ( $fp );
+			$this->_error = "failed to send client protocol version";
+			return false;
+		}
+
+		// check version
+		list(,$v) = unpack ( "N*", fread ( $fp, 4 ) );
+		$v = (int)$v;
+		if ( $v<1 )
+		{
+			fclose ( $fp );
+			$this->_error = "expected searchd protocol version 1+, got version '$v'";
+			return false;
+		}
+
+		return $fp;
+	}
+
+	/// get and check response packet from searchd server
+	function _GetResponse ( $fp, $client_ver )
+	{
+		$response = "";
+		$len = 0;
+
+		$header = fread ( $fp, 8 );
+		if ( strlen($header)==8 )
+		{
+			list ( $status, $ver, $len ) = array_values ( unpack ( "n2a/Nb", $header ) );
+			$left = $len;
+			while ( $left>0 && !feof($fp) )
+			{
+				$chunk = fread ( $fp, min ( 8192, $left ) );
+				if ( $chunk )
+				{
+					$response .= $chunk;
+					$left -= strlen($chunk);
+				}
+			}
+		}
+		if ( $this->_socket === false )
+			fclose ( $fp );
+
+		// check response
+		$read = strlen ( $response );
+		if ( !$response || $read!=$len )
+		{
+			$this->_error = $len
+				? "failed to read searchd response (status=$status, ver=$ver, len=$len, read=$read)"
+				: "received zero-sized searchd response";
+			return false;
+		}
+
+		// check status
+		if ( $status==SEARCHD_WARNING )
+		{
+			list(,$wlen) = unpack ( "N*", substr ( $response, 0, 4 ) );
+			$this->_warning = substr ( $response, 4, $wlen );
+			return substr ( $response, 4+$wlen );
+		}
+		if ( $status==SEARCHD_ERROR )
+		{
+			$this->_error = "searchd error: " . substr ( $response, 4 );
+			return false;
+		}
+		if ( $status==SEARCHD_RETRY )
+		{
+			$this->_error = "temporary searchd error: " . substr ( $response, 4 );
+			return false;
+		}
+		if ( $status!=SEARCHD_OK )
+		{
+			$this->_error = "unknown status code '$status'";
+			return false;
+		}
+
+		// check version
+		if ( $ver<$client_ver )
+		{
+			$this->_warning = sprintf ( "searchd command v.%d.%d older than client's v.%d.%d, some options might not work",
+				$ver>>8, $ver&0xff, $client_ver>>8, $client_ver&0xff );
+		}
+
+		return $response;
+	}
+
+	/////////////////////////////////////////////////////////////////////////////
+	// searching
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// set offset and count into result set,
+	/// and optionally set max-matches and cutoff limits
+	function SetLimits ( $offset, $limit, $max=0, $cutoff=0 )
+	{
+		assert ( is_int($offset) );
+		assert ( is_int($limit) );
+		assert ( $offset>=0 );
+		assert ( $limit>0 );
+		assert ( $max>=0 );
+		$this->_offset = $offset;
+		$this->_limit = $limit;
+		if ( $max>0 )
+			$this->_maxmatches = $max;
+		if ( $cutoff>0 )
+			$this->_cutoff = $cutoff;
+	}
+
+	/// set maximum query time, in milliseconds, per-index
+	/// integer, 0 means "do not limit"
+	function SetMaxQueryTime ( $max )
+	{
+		assert ( is_int($max) );
+		assert ( $max>=0 );
+		$this->_maxquerytime = $max;
+	}
+
+	/// set matching mode
+	function SetMatchMode ( $mode )
+	{
+		assert ( $mode==SPH_MATCH_ALL
+			|| $mode==SPH_MATCH_ANY
+			|| $mode==SPH_MATCH_PHRASE
+			|| $mode==SPH_MATCH_BOOLEAN
+			|| $mode==SPH_MATCH_EXTENDED
+			|| $mode==SPH_MATCH_FULLSCAN
+			|| $mode==SPH_MATCH_EXTENDED2 );
+		$this->_mode = $mode;
+	}
+
+	/// set ranking mode
+	function SetRankingMode ( $ranker, $rankexpr="" )
+	{
+		assert ( $ranker>=0 && $ranker<SPH_RANK_TOTAL );
+		assert ( is_string($rankexpr) );
+		$this->_ranker = $ranker;
+		$this->_rankexpr = $rankexpr;
+	}
+
+	/// set matches sorting mode
+	function SetSortMode ( $mode, $sortby="" )
+	{
+		assert (
+			$mode==SPH_SORT_RELEVANCE ||
+			$mode==SPH_SORT_ATTR_DESC ||
+			$mode==SPH_SORT_ATTR_ASC ||
+			$mode==SPH_SORT_TIME_SEGMENTS ||
+			$mode==SPH_SORT_EXTENDED ||
+			$mode==SPH_SORT_EXPR );
+		assert ( is_string($sortby) );
+		assert ( $mode==SPH_SORT_RELEVANCE || strlen($sortby)>0 );
+
+		$this->_sort = $mode;
+		$this->_sortby = $sortby;
+	}
+
+	/// bind per-field weights by order
+	/// DEPRECATED; use SetFieldWeights() instead
+	function SetWeights ( $weights )
+	{
+		assert ( is_array($weights) );
+		foreach ( $weights as $weight )
+			assert ( is_int($weight) );
+
+		$this->_weights = $weights;
+	}
+
+	/// bind per-field weights by name
+	function SetFieldWeights ( $weights )
+	{
+		assert ( is_array($weights) );
+		foreach ( $weights as $name=>$weight )
+		{
+			assert ( is_string($name) );
+			assert ( is_int($weight) );
+		}
+		$this->_fieldweights = $weights;
+	}
+
+	/// bind per-index weights by name
+	function SetIndexWeights ( $weights )
+	{
+		assert ( is_array($weights) );
+		foreach ( $weights as $index=>$weight )
+		{
+			assert ( is_string($index) );
+			assert ( is_int($weight) );
+		}
+		$this->_indexweights = $weights;
+	}
+
+	/// set IDs range to match
+	/// only match records if document ID is beetwen $min and $max (inclusive)
+	function SetIDRange ( $min, $max )
+	{
+		assert ( is_numeric($min) );
+		assert ( is_numeric($max) );
+		assert ( $min<=$max );
+		$this->_min_id = $min;
+		$this->_max_id = $max;
+	}
+
+	/// set values set filter
+	/// only match records where $attribute value is in given set
+	function SetFilter ( $attribute, $values, $exclude=false )
+	{
+		assert ( is_string($attribute) );
+		assert ( is_array($values) );
+		assert ( count($values) );
+
+		if ( is_array($values) && count($values) )
+		{
+			foreach ( $values as $value )
+				assert ( is_numeric($value) );
+
+			$this->_filters[] = array ( "type"=>SPH_FILTER_VALUES, "attr"=>$attribute, "exclude"=>$exclude, "values"=>$values );
+		}
+	}
+
+	/// set range filter
+	/// only match records if $attribute value is beetwen $min and $max (inclusive)
+	function SetFilterRange ( $attribute, $min, $max, $exclude=false )
+	{
+		assert ( is_string($attribute) );
+		assert ( is_numeric($min) );
+		assert ( is_numeric($max) );
+		assert ( $min<=$max );
+
+		$this->_filters[] = array ( "type"=>SPH_FILTER_RANGE, "attr"=>$attribute, "exclude"=>$exclude, "min"=>$min, "max"=>$max );
+	}
+
+	/// set float range filter
+	/// only match records if $attribute value is beetwen $min and $max (inclusive)
+	function SetFilterFloatRange ( $attribute, $min, $max, $exclude=false )
+	{
+		assert ( is_string($attribute) );
+		assert ( is_float($min) );
+		assert ( is_float($max) );
+		assert ( $min<=$max );
+
+		$this->_filters[] = array ( "type"=>SPH_FILTER_FLOATRANGE, "attr"=>$attribute, "exclude"=>$exclude, "min"=>$min, "max"=>$max );
+	}
+
+	/// setup anchor point for geosphere distance calculations
+	/// required to use @geodist in filters and sorting
+	/// latitude and longitude must be in radians
+	function SetGeoAnchor ( $attrlat, $attrlong, $lat, $long )
+	{
+		assert ( is_string($attrlat) );
+		assert ( is_string($attrlong) );
+		assert ( is_float($lat) );
+		assert ( is_float($long) );
+
+		$this->_anchor = array ( "attrlat"=>$attrlat, "attrlong"=>$attrlong, "lat"=>$lat, "long"=>$long );
+	}
+
+	/// set grouping attribute and function
+	function SetGroupBy ( $attribute, $func, $groupsort="@group desc" )
+	{
+		assert ( is_string($attribute) );
+		assert ( is_string($groupsort) );
+		assert ( $func==SPH_GROUPBY_DAY
+			|| $func==SPH_GROUPBY_WEEK
+			|| $func==SPH_GROUPBY_MONTH
+			|| $func==SPH_GROUPBY_YEAR
+			|| $func==SPH_GROUPBY_ATTR
+			|| $func==SPH_GROUPBY_ATTRPAIR );
+
+		$this->_groupby = $attribute;
+		$this->_groupfunc = $func;
+		$this->_groupsort = $groupsort;
+	}
+
+	/// set count-distinct attribute for group-by queries
+	function SetGroupDistinct ( $attribute )
+	{
+		assert ( is_string($attribute) );
+		$this->_groupdistinct = $attribute;
+	}
+
+	/// set distributed retries count and delay
+	function SetRetries ( $count, $delay=0 )
+	{
+		assert ( is_int($count) && $count>=0 );
+		assert ( is_int($delay) && $delay>=0 );
+		$this->_retrycount = $count;
+		$this->_retrydelay = $delay;
+	}
+
+	/// set result set format (hash or array; hash by default)
+	/// PHP specific; needed for group-by-MVA result sets that may contain duplicate IDs
+	function SetArrayResult ( $arrayresult )
+	{
+		assert ( is_bool($arrayresult) );
+		$this->_arrayresult = $arrayresult;
+	}
+
+	/// set attribute values override
+	/// there can be only one override per attribute
+	/// $values must be a hash that maps document IDs to attribute values
+	function SetOverride ( $attrname, $attrtype, $values )
+	{
+		assert ( is_string ( $attrname ) );
+		assert ( in_array ( $attrtype, array ( SPH_ATTR_INTEGER, SPH_ATTR_TIMESTAMP, SPH_ATTR_BOOL, SPH_ATTR_FLOAT, SPH_ATTR_BIGINT ) ) );
+		assert ( is_array ( $values ) );
+
+		$this->_overrides[$attrname] = array ( "attr"=>$attrname, "type"=>$attrtype, "values"=>$values );
+	}
+
+	/// set select-list (attributes or expressions), SQL-like syntax
+	function SetSelect ( $select )
+	{
+		assert ( is_string ( $select ) );
+		$this->_select = $select;
+	}
+
+	//////////////////////////////////////////////////////////////////////////////
+
+	/// clear all filters (for multi-queries)
+	function ResetFilters ()
+	{
+		$this->_filters = array();
+		$this->_anchor = array();
+	}
+
+	/// clear groupby settings (for multi-queries)
+	function ResetGroupBy ()
+	{
+		$this->_groupby		= "";
+		$this->_groupfunc	= SPH_GROUPBY_DAY;
+		$this->_groupsort	= "@group desc";
+		$this->_groupdistinct= "";
+	}
+
+	/// clear all attribute value overrides (for multi-queries)
+	function ResetOverrides ()
+    {
+    	$this->_overrides = array ();
+    }
+
+	//////////////////////////////////////////////////////////////////////////////
+
+	/// connect to searchd server, run given search query through given indexes,
+	/// and return the search results
+	function Query ( $query, $index="*", $comment="" )
+	{
+		assert ( empty($this->_reqs) );
+
+		$this->AddQuery ( $query, $index, $comment );
+		$results = $this->RunQueries ();
+		$this->_reqs = array (); // just in case it failed too early
+
+		if ( !is_array($results) )
+			return false; // probably network error; error message should be already filled
+
+		$this->_error = $results[0]["error"];
+		$this->_warning = $results[0]["warning"];
+		if ( $results[0]["status"]==SEARCHD_ERROR )
+			return false;
+		else
+			return $results[0];
+	}
+
+	/// helper to pack floats in network byte order
+	function _PackFloat ( $f )
+	{
+		$t1 = pack ( "f", $f ); // machine order
+		list(,$t2) = unpack ( "L*", $t1 ); // int in machine order
+		return pack ( "N", $t2 );
+	}
+
+	/// add query to multi-query batch
+	/// returns index into results array from RunQueries() call
+	function AddQuery ( $query, $index="*", $comment="" )
+	{
+		// mbstring workaround
+		$this->_MBPush ();
+
+		// build request
+		$req = pack ( "NNNN", $this->_offset, $this->_limit, $this->_mode, $this->_ranker );
+		if ( $this->_ranker==SPH_RANK_EXPR )
+			$req .= pack ( "N", strlen($this->_rankexpr) ) . $this->_rankexpr;
+		$req .= pack ( "N", $this->_sort ); // (deprecated) sort mode
+		$req .= pack ( "N", strlen($this->_sortby) ) . $this->_sortby;
+		$req .= pack ( "N", strlen($query) ) . $query; // query itself
+		$req .= pack ( "N", count($this->_weights) ); // weights
+		foreach ( $this->_weights as $weight )
+			$req .= pack ( "N", (int)$weight );
+		$req .= pack ( "N", strlen($index) ) . $index; // indexes
+		$req .= pack ( "N", 1 ); // id64 range marker
+		$req .= sphPackU64 ( $this->_min_id ) . sphPackU64 ( $this->_max_id ); // id64 range
+
+		// filters
+		$req .= pack ( "N", count($this->_filters) );
+		foreach ( $this->_filters as $filter )
+		{
+			$req .= pack ( "N", strlen($filter["attr"]) ) . $filter["attr"];
+			$req .= pack ( "N", $filter["type"] );
+			switch ( $filter["type"] )
+			{
+				case SPH_FILTER_VALUES:
+					$req .= pack ( "N", count($filter["values"]) );
+					foreach ( $filter["values"] as $value )
+						$req .= sphPackI64 ( $value );
+					break;
+
+				case SPH_FILTER_RANGE:
+					$req .= sphPackI64 ( $filter["min"] ) . sphPackI64 ( $filter["max"] );
+					break;
+
+				case SPH_FILTER_FLOATRANGE:
+					$req .= $this->_PackFloat ( $filter["min"] ) . $this->_PackFloat ( $filter["max"] );
+					break;
+
+				default:
+					assert ( 0 && "internal error: unhandled filter type" );
+			}
+			$req .= pack ( "N", $filter["exclude"] );
+		}
+
+		// group-by clause, max-matches count, group-sort clause, cutoff count
+		$req .= pack ( "NN", $this->_groupfunc, strlen($this->_groupby) ) . $this->_groupby;
+		$req .= pack ( "N", $this->_maxmatches );
+		$req .= pack ( "N", strlen($this->_groupsort) ) . $this->_groupsort;
+		$req .= pack ( "NNN", $this->_cutoff, $this->_retrycount, $this->_retrydelay );
+		$req .= pack ( "N", strlen($this->_groupdistinct) ) . $this->_groupdistinct;
+
+		// anchor point
+		if ( empty($this->_anchor) )
+		{
+			$req .= pack ( "N", 0 );
+		} else
+		{
+			$a =& $this->_anchor;
+			$req .= pack ( "N", 1 );
+			$req .= pack ( "N", strlen($a["attrlat"]) ) . $a["attrlat"];
+			$req .= pack ( "N", strlen($a["attrlong"]) ) . $a["attrlong"];
+			$req .= $this->_PackFloat ( $a["lat"] ) . $this->_PackFloat ( $a["long"] );
+		}
+
+		// per-index weights
+		$req .= pack ( "N", count($this->_indexweights) );
+		foreach ( $this->_indexweights as $idx=>$weight )
+			$req .= pack ( "N", strlen($idx) ) . $idx . pack ( "N", $weight );
+
+		// max query time
+		$req .= pack ( "N", $this->_maxquerytime );
+
+		// per-field weights
+		$req .= pack ( "N", count($this->_fieldweights) );
+		foreach ( $this->_fieldweights as $field=>$weight )
+			$req .= pack ( "N", strlen($field) ) . $field . pack ( "N", $weight );
+
+		// comment
+		$req .= pack ( "N", strlen($comment) ) . $comment;
+
+		// attribute overrides
+		$req .= pack ( "N", count($this->_overrides) );
+		foreach ( $this->_overrides as $key => $entry )
+		{
+			$req .= pack ( "N", strlen($entry["attr"]) ) . $entry["attr"];
+			$req .= pack ( "NN", $entry["type"], count($entry["values"]) );
+			foreach ( $entry["values"] as $id=>$val )
+			{
+				assert ( is_numeric($id) );
+				assert ( is_numeric($val) );
+
+				$req .= sphPackU64 ( $id );
+				switch ( $entry["type"] )
+				{
+					case SPH_ATTR_FLOAT:	$req .= $this->_PackFloat ( $val ); break;
+					case SPH_ATTR_BIGINT:	$req .= sphPackI64 ( $val ); break;
+					default:				$req .= pack ( "N", $val ); break;
+				}
+			}
+		}
+
+		// select-list
+		$req .= pack ( "N", strlen($this->_select) ) . $this->_select;
+
+		// mbstring workaround
+		$this->_MBPop ();
+
+		// store request to requests array
+		$this->_reqs[] = $req;
+		return count($this->_reqs)-1;
+	}
+
+	/// connect to searchd, run queries batch, and return an array of result sets
+	function RunQueries ()
+	{
+		if ( empty($this->_reqs) )
+		{
+			$this->_error = "no queries defined, issue AddQuery() first";
+			return false;
+		}
+
+		// mbstring workaround
+		$this->_MBPush ();
+
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop ();
+			return false;
+		}
+
+		// send query, get response
+		$nreqs = count($this->_reqs);
+		$req = join ( "", $this->_reqs );
+		$len = 8+strlen($req);
+		$req = pack ( "nnNNN", SEARCHD_COMMAND_SEARCH, VER_COMMAND_SEARCH, $len, 0, $nreqs ) . $req; // add header
+
+		if ( !( $this->_Send ( $fp, $req, $len+8 ) ) ||
+			 !( $response = $this->_GetResponse ( $fp, VER_COMMAND_SEARCH ) ) )
+		{
+			$this->_MBPop ();
+			return false;
+		}
+
+		// query sent ok; we can reset reqs now
+		$this->_reqs = array ();
+
+		// parse and return response
+		return $this->_ParseSearchResponse ( $response, $nreqs );
+	}
+
+	/// parse and return search query (or queries) response
+	function _ParseSearchResponse ( $response, $nreqs )
+	{
+		$p = 0; // current position
+		$max = strlen($response); // max position for checks, to protect against broken responses
+
+		$results = array ();
+		for ( $ires=0; $ires<$nreqs && $p<$max; $ires++ )
+		{
+			$results[] = array();
+			$result =& $results[$ires];
+
+			$result["error"] = "";
+			$result["warning"] = "";
+
+			// extract status
+			list(,$status) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+			$result["status"] = $status;
+			if ( $status!=SEARCHD_OK )
+			{
+				list(,$len) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				$message = substr ( $response, $p, $len ); $p += $len;
+
+				if ( $status==SEARCHD_WARNING )
+				{
+					$result["warning"] = $message;
+				} else
+				{
+					$result["error"] = $message;
+					continue;
+				}
+			}
+
+			// read schema
+			$fields = array ();
+			$attrs = array ();
+
+			list(,$nfields) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+			while ( $nfields-->0 && $p<$max )
+			{
+				list(,$len) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				$fields[] = substr ( $response, $p, $len ); $p += $len;
+			}
+			$result["fields"] = $fields;
+
+			list(,$nattrs) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+			while ( $nattrs-->0 && $p<$max  )
+			{
+				list(,$len) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				$attr = substr ( $response, $p, $len ); $p += $len;
+				list(,$type) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				$attrs[$attr] = $type;
+			}
+			$result["attrs"] = $attrs;
+
+			// read match count
+			list(,$count) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+			list(,$id64) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+
+			// read matches
+			$idx = -1;
+			while ( $count-->0 && $p<$max )
+			{
+				// index into result array
+				$idx++;
+
+				// parse document id and weight
+				if ( $id64 )
+				{
+					$doc = sphUnpackU64 ( substr ( $response, $p, 8 ) ); $p += 8;
+					list(,$weight) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				}
+				else
+				{
+					list ( $doc, $weight ) = array_values ( unpack ( "N*N*",
+						substr ( $response, $p, 8 ) ) );
+					$p += 8;
+					$doc = sphFixUint($doc);
+				}
+				$weight = sprintf ( "%u", $weight );
+
+				// create match entry
+				if ( $this->_arrayresult )
+					$result["matches"][$idx] = array ( "id"=>$doc, "weight"=>$weight );
+				else
+					$result["matches"][$doc]["weight"] = $weight;
+
+				// parse and create attributes
+				$attrvals = array ();
+				foreach ( $attrs as $attr=>$type )
+				{
+					// handle 64bit ints
+					if ( $type==SPH_ATTR_BIGINT )
+					{
+						$attrvals[$attr] = sphUnpackI64 ( substr ( $response, $p, 8 ) ); $p += 8;
+						continue;
+					}
+
+					// handle floats
+					if ( $type==SPH_ATTR_FLOAT )
+					{
+						list(,$uval) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+						list(,$fval) = unpack ( "f*", pack ( "L", $uval ) ); 
+						$attrvals[$attr] = $fval;
+						continue;
+					}
+
+					// handle everything else as unsigned ints
+					list(,$val) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+					if ( $type==SPH_ATTR_MULTI )
+					{
+						$attrvals[$attr] = array ();
+						$nvalues = $val;
+						while ( $nvalues-->0 && $p<$max )
+						{
+							list(,$val) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+							$attrvals[$attr][] = sphFixUint($val);
+						}
+					} else if ( $type==SPH_ATTR_MULTI64 )
+					{
+						$attrvals[$attr] = array ();
+						$nvalues = $val;
+						while ( $nvalues>0 && $p<$max )
+						{
+							$attrvals[$attr][] = sphUnpackU64 ( substr ( $response, $p, 8 ) ); $p += 8;
+							$nvalues -= 2;
+						}
+					} else if ( $type==SPH_ATTR_STRING )
+					{
+						$attrvals[$attr] = substr ( $response, $p, $val );
+						$p += $val;						
+					} else
+					{
+						$attrvals[$attr] = sphFixUint($val);
+					}
+				}
+
+				if ( $this->_arrayresult )
+					$result["matches"][$idx]["attrs"] = $attrvals;
+				else
+					$result["matches"][$doc]["attrs"] = $attrvals;
+			}
+
+			list ( $total, $total_found, $msecs, $words ) =
+				array_values ( unpack ( "N*N*N*N*", substr ( $response, $p, 16 ) ) );
+			$result["total"] = sprintf ( "%u", $total );
+			$result["total_found"] = sprintf ( "%u", $total_found );
+			$result["time"] = sprintf ( "%.3f", $msecs/1000 );
+			$p += 16;
+
+			while ( $words-->0 && $p<$max )
+			{
+				list(,$len) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+				$word = substr ( $response, $p, $len ); $p += $len;
+				list ( $docs, $hits ) = array_values ( unpack ( "N*N*", substr ( $response, $p, 8 ) ) ); $p += 8;
+				$result["words"][$word] = array (
+					"docs"=>sprintf ( "%u", $docs ),
+					"hits"=>sprintf ( "%u", $hits ) );
+			}
+		}
+
+		$this->_MBPop ();
+		return $results;
+	}
+
+	/////////////////////////////////////////////////////////////////////////////
+	// excerpts generation
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// connect to searchd server, and generate exceprts (snippets)
+	/// of given documents for given query. returns false on failure,
+	/// an array of snippets on success
+	function BuildExcerpts ( $docs, $index, $words, $opts=array() )
+	{
+		assert ( is_array($docs) );
+		assert ( is_string($index) );
+		assert ( is_string($words) );
+		assert ( is_array($opts) );
+
+		$this->_MBPush ();
+
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop();
+			return false;
+		}
+
+		/////////////////
+		// fixup options
+		/////////////////
+
+		if ( !isset($opts["before_match"]) )		$opts["before_match"] = "<b>";
+		if ( !isset($opts["after_match"]) )			$opts["after_match"] = "</b>";
+		if ( !isset($opts["chunk_separator"]) )		$opts["chunk_separator"] = " ... ";
+		if ( !isset($opts["limit"]) )				$opts["limit"] = 256;
+		if ( !isset($opts["limit_passages"]) )		$opts["limit_passages"] = 0;
+		if ( !isset($opts["limit_words"]) )			$opts["limit_words"] = 0;
+		if ( !isset($opts["around"]) )				$opts["around"] = 5;
+		if ( !isset($opts["exact_phrase"]) )		$opts["exact_phrase"] = false;
+		if ( !isset($opts["single_passage"]) )		$opts["single_passage"] = false;
+		if ( !isset($opts["use_boundaries"]) )		$opts["use_boundaries"] = false;
+		if ( !isset($opts["weight_order"]) )		$opts["weight_order"] = false;
+		if ( !isset($opts["query_mode"]) )			$opts["query_mode"] = false;
+		if ( !isset($opts["force_all_words"]) )		$opts["force_all_words"] = false;
+		if ( !isset($opts["start_passage_id"]) )	$opts["start_passage_id"] = 1;
+		if ( !isset($opts["load_files"]) )			$opts["load_files"] = false;
+		if ( !isset($opts["html_strip_mode"]) )		$opts["html_strip_mode"] = "index";
+		if ( !isset($opts["allow_empty"]) )			$opts["allow_empty"] = false;
+		if ( !isset($opts["passage_boundary"]) )	$opts["passage_boundary"] = "none";
+		if ( !isset($opts["emit_zones"]) )			$opts["emit_zones"] = false;
+		if ( !isset($opts["load_files_scattered"]) )		$opts["load_files_scattered"] = false;
+		
+
+		/////////////////
+		// build request
+		/////////////////
+
+		// v.1.2 req
+		$flags = 1; // remove spaces
+		if ( $opts["exact_phrase"] )	$flags |= 2;
+		if ( $opts["single_passage"] )	$flags |= 4;
+		if ( $opts["use_boundaries"] )	$flags |= 8;
+		if ( $opts["weight_order"] )	$flags |= 16;
+		if ( $opts["query_mode"] )		$flags |= 32;
+		if ( $opts["force_all_words"] )	$flags |= 64;
+		if ( $opts["load_files"] )		$flags |= 128;
+		if ( $opts["allow_empty"] )		$flags |= 256;
+		if ( $opts["emit_zones"] )		$flags |= 512;
+		if ( $opts["load_files_scattered"] )	$flags |= 1024;
+		$req = pack ( "NN", 0, $flags ); // mode=0, flags=$flags
+		$req .= pack ( "N", strlen($index) ) . $index; // req index
+		$req .= pack ( "N", strlen($words) ) . $words; // req words
+
+		// options
+		$req .= pack ( "N", strlen($opts["before_match"]) ) . $opts["before_match"];
+		$req .= pack ( "N", strlen($opts["after_match"]) ) . $opts["after_match"];
+		$req .= pack ( "N", strlen($opts["chunk_separator"]) ) . $opts["chunk_separator"];
+		$req .= pack ( "NN", (int)$opts["limit"], (int)$opts["around"] );
+		$req .= pack ( "NNN", (int)$opts["limit_passages"], (int)$opts["limit_words"], (int)$opts["start_passage_id"] ); // v.1.2
+		$req .= pack ( "N", strlen($opts["html_strip_mode"]) ) . $opts["html_strip_mode"];
+		$req .= pack ( "N", strlen($opts["passage_boundary"]) ) . $opts["passage_boundary"];
+
+		// documents
+		$req .= pack ( "N", count($docs) );
+		foreach ( $docs as $doc )
+		{
+			assert ( is_string($doc) );
+			$req .= pack ( "N", strlen($doc) ) . $doc;
+		}
+
+		////////////////////////////
+		// send query, get response
+		////////////////////////////
+
+		$len = strlen($req);
+		$req = pack ( "nnN", SEARCHD_COMMAND_EXCERPT, VER_COMMAND_EXCERPT, $len ) . $req; // add header
+		if ( !( $this->_Send ( $fp, $req, $len+8 ) ) ||
+			 !( $response = $this->_GetResponse ( $fp, VER_COMMAND_EXCERPT ) ) )
+		{
+			$this->_MBPop ();
+			return false;
+		}
+
+		//////////////////
+		// parse response
+		//////////////////
+
+		$pos = 0;
+		$res = array ();
+		$rlen = strlen($response);
+		for ( $i=0; $i<count($docs); $i++ )
+		{
+			list(,$len) = unpack ( "N*", substr ( $response, $pos, 4 ) );
+			$pos += 4;
+
+			if ( $pos+$len > $rlen )
+			{
+				$this->_error = "incomplete reply";
+				$this->_MBPop ();
+				return false;
+			}
+			$res[] = $len ? substr ( $response, $pos, $len ) : "";
+			$pos += $len;
+		}
+
+		$this->_MBPop ();
+		return $res;
+	}
+
+
+	/////////////////////////////////////////////////////////////////////////////
+	// keyword generation
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// connect to searchd server, and generate keyword list for a given query
+	/// returns false on failure,
+	/// an array of words on success
+	function BuildKeywords ( $query, $index, $hits )
+	{
+		assert ( is_string($query) );
+		assert ( is_string($index) );
+		assert ( is_bool($hits) );
+
+		$this->_MBPush ();
+
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop();
+			return false;
+		}
+
+		/////////////////
+		// build request
+		/////////////////
+
+		// v.1.0 req
+		$req  = pack ( "N", strlen($query) ) . $query; // req query
+		$req .= pack ( "N", strlen($index) ) . $index; // req index
+		$req .= pack ( "N", (int)$hits );
+
+		////////////////////////////
+		// send query, get response
+		////////////////////////////
+
+		$len = strlen($req);
+		$req = pack ( "nnN", SEARCHD_COMMAND_KEYWORDS, VER_COMMAND_KEYWORDS, $len ) . $req; // add header
+		if ( !( $this->_Send ( $fp, $req, $len+8 ) ) ||
+			 !( $response = $this->_GetResponse ( $fp, VER_COMMAND_KEYWORDS ) ) )
+		{
+			$this->_MBPop ();
+			return false;
+		}
+
+		//////////////////
+		// parse response
+		//////////////////
+
+		$pos = 0;
+		$res = array ();
+		$rlen = strlen($response);
+		list(,$nwords) = unpack ( "N*", substr ( $response, $pos, 4 ) );
+		$pos += 4;
+		for ( $i=0; $i<$nwords; $i++ )
+		{
+			list(,$len) = unpack ( "N*", substr ( $response, $pos, 4 ) );	$pos += 4;
+			$tokenized = $len ? substr ( $response, $pos, $len ) : "";
+			$pos += $len;
+
+			list(,$len) = unpack ( "N*", substr ( $response, $pos, 4 ) );	$pos += 4;
+			$normalized = $len ? substr ( $response, $pos, $len ) : "";
+			$pos += $len;
+
+			$res[] = array ( "tokenized"=>$tokenized, "normalized"=>$normalized );
+
+			if ( $hits )
+			{
+				list($ndocs,$nhits) = array_values ( unpack ( "N*N*", substr ( $response, $pos, 8 ) ) );
+				$pos += 8;
+				$res [$i]["docs"] = $ndocs;
+				$res [$i]["hits"] = $nhits;
+			}
+
+			if ( $pos > $rlen )
+			{
+				$this->_error = "incomplete reply";
+				$this->_MBPop ();
+				return false;
+			}
+		}
+
+		$this->_MBPop ();
+		return $res;
+	}
+
+	function EscapeString ( $string )
+	{
+		$from = array ( '\\', '(',')','|','-','!','@','~','"','&', '/', '^', '$', '=' );
+		$to   = array ( '\\\\', '\(','\)','\|','\-','\!','\@','\~','\"', '\&', '\/', '\^', '\$', '\=' );
+
+		return str_replace ( $from, $to, $string );
+	}
+
+	/////////////////////////////////////////////////////////////////////////////
+	// attribute updates
+	/////////////////////////////////////////////////////////////////////////////
+
+	/// batch update given attributes in given rows in given indexes
+	/// returns amount of updated documents (0 or more) on success, or -1 on failure
+	function UpdateAttributes ( $index, $attrs, $values, $mva=false )
+	{
+		// verify everything
+		assert ( is_string($index) );
+		assert ( is_bool($mva) );
+
+		assert ( is_array($attrs) );
+		foreach ( $attrs as $attr )
+			assert ( is_string($attr) );
+
+		assert ( is_array($values) );
+		foreach ( $values as $id=>$entry )
+		{
+			assert ( is_numeric($id) );
+			assert ( is_array($entry) );
+			assert ( count($entry)==count($attrs) );
+			foreach ( $entry as $v )
+			{
+				if ( $mva )
+				{
+					assert ( is_array($v) );
+					foreach ( $v as $vv )
+						assert ( is_int($vv) );
+				} else
+					assert ( is_int($v) );
+			}
+		}
+
+		// build request
+		$this->_MBPush ();
+		$req = pack ( "N", strlen($index) ) . $index;
+
+		$req .= pack ( "N", count($attrs) );
+		foreach ( $attrs as $attr )
+		{
+			$req .= pack ( "N", strlen($attr) ) . $attr;
+			$req .= pack ( "N", $mva ? 1 : 0 );
+		}
+
+		$req .= pack ( "N", count($values) );
+		foreach ( $values as $id=>$entry )
+		{
+			$req .= sphPackU64 ( $id );
+			foreach ( $entry as $v )
+			{
+				$req .= pack ( "N", $mva ? count($v) : $v );
+				if ( $mva )
+					foreach ( $v as $vv )
+						$req .= pack ( "N", $vv );
+			}
+		}
+
+		// connect, send query, get response
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop ();
+			return -1;
+		}
+
+		$len = strlen($req);
+		$req = pack ( "nnN", SEARCHD_COMMAND_UPDATE, VER_COMMAND_UPDATE, $len ) . $req; // add header
+		if ( !$this->_Send ( $fp, $req, $len+8 ) )
+		{
+			$this->_MBPop ();
+			return -1;
+		}
+
+		if (!( $response = $this->_GetResponse ( $fp, VER_COMMAND_UPDATE ) ))
+		{
+			$this->_MBPop ();
+			return -1;
+		}
+
+		// parse response
+		list(,$updated) = unpack ( "N*", substr ( $response, 0, 4 ) );
+		$this->_MBPop ();
+		return $updated;
+	}
+
+	/////////////////////////////////////////////////////////////////////////////
+	// persistent connections
+	/////////////////////////////////////////////////////////////////////////////
+
+	function Open()
+	{
+		if ( $this->_socket !== false )
+		{
+			$this->_error = 'already connected';
+			return false;
+		}
+		if ( !$fp = $this->_Connect() )
+			return false;
+
+		// command, command version = 0, body length = 4, body = 1
+		$req = pack ( "nnNN", SEARCHD_COMMAND_PERSIST, 0, 4, 1 );
+		if ( !$this->_Send ( $fp, $req, 12 ) )
+			return false;
+
+		$this->_socket = $fp;
+		return true;
+	}
+
+	function Close()
+	{
+		if ( $this->_socket === false )
+		{
+			$this->_error = 'not connected';
+			return false;
+		}
+
+		fclose ( $this->_socket );
+		$this->_socket = false;
+		
+		return true;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// status
+	//////////////////////////////////////////////////////////////////////////
+
+	function Status ()
+	{
+		$this->_MBPush ();
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop();
+			return false;
+		}
+
+		$req = pack ( "nnNN", SEARCHD_COMMAND_STATUS, VER_COMMAND_STATUS, 4, 1 ); // len=4, body=1
+		if ( !( $this->_Send ( $fp, $req, 12 ) ) ||
+			 !( $response = $this->_GetResponse ( $fp, VER_COMMAND_STATUS ) ) )
+		{
+			$this->_MBPop ();
+			return false;
+		}
+
+		$res = substr ( $response, 4 ); // just ignore length, error handling, etc
+		$p = 0;
+		list ( $rows, $cols ) = array_values ( unpack ( "N*N*", substr ( $response, $p, 8 ) ) ); $p += 8;
+
+		$res = array();
+		for ( $i=0; $i<$rows; $i++ )
+			for ( $j=0; $j<$cols; $j++ )
+		{
+			list(,$len) = unpack ( "N*", substr ( $response, $p, 4 ) ); $p += 4;
+			$res[$i][] = substr ( $response, $p, $len ); $p += $len;
+		}
+
+		$this->_MBPop ();
+		return $res;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// flush
+	//////////////////////////////////////////////////////////////////////////
+
+	function FlushAttributes ()
+	{
+		$this->_MBPush ();
+		if (!( $fp = $this->_Connect() ))
+		{
+			$this->_MBPop();
+			return -1;
+		}
+
+		$req = pack ( "nnN", SEARCHD_COMMAND_FLUSHATTRS, VER_COMMAND_FLUSHATTRS, 0 ); // len=0
+		if ( !( $this->_Send ( $fp, $req, 8 ) ) ||
+			 !( $response = $this->_GetResponse ( $fp, VER_COMMAND_FLUSHATTRS ) ) )
+		{
+			$this->_MBPop ();
+			return -1;
+		}
+
+		$tag = -1;
+		if ( strlen($response)==4 )
+			list(,$tag) = unpack ( "N*", $response );
+		else
+			$this->_error = "unexpected response length";
+
+		$this->_MBPop ();
+		return $tag;
+	}
+}
+
+//
+// $Id: sphinxapi.php 3087 2012-01-30 23:07:35Z shodan $
+//