4 files changed, 113 insertions, 6 deletions
diff --git a/phpBB/phpbb/template/base.php b/phpBB/phpbb/template/base.php
index 9a40702ba8..41c0a01ba8 100644
--- a/phpBB/phpbb/template/base.php
+++ b/phpBB/phpbb/template/base.php
@@ -133,6 +133,14 @@ abstract class base implements template
 	}
 
 	/**
+	* {@inheritdoc}
+	*/
+	public function find_key_index($blockname, $key)
+	{
+		return $this->context->find_key_index($blockname, $key);
+	}
+
+	/**
 	* Calls hook if any is defined.
 	*
 	* @param string $handle Template handle being displayed.
diff --git a/phpBB/phpbb/template/context.php b/phpBB/phpbb/template/context.php
index 4ee48205c8..c7df29d62c 100644
--- a/phpBB/phpbb/template/context.php
+++ b/phpBB/phpbb/template/context.php
@@ -264,6 +264,89 @@ class context
 	}
 
 	/**
+	* Find the index for a specified key in the innermost specified block
+	*
+	* @param	string	$blockname	the blockname, for example 'loop'
+	* @param	mixed	$key		Key to search for
+	*
+	* array: KEY => VALUE [the key/value pair to search for within the loop to determine the correct position]
+	*
+	* int: Position [the position to search for]
+	*
+	* If key is false the position is set to 0
+	* If key is true the position is set to the last entry
+	*
+	* @return mixed false if not found, index position otherwise; be sure to test with ===
+	*/
+	public function find_key_index($blockname, $key)
+	{
+		// For nested block, $blockcount > 0, for top-level block, $blockcount == 0
+		$blocks = explode('.', $blockname);
+		$blockcount = sizeof($blocks) - 1;
+
+		$block = $this->tpldata;
+		for ($i = 0; $i < $blockcount; $i++)
+		{
+			if (($pos = strpos($blocks[$i], '[')) !== false)
+			{
+				$name = substr($blocks[$i], 0, $pos);
+
+				if (strpos($blocks[$i], '[]') === $pos)
+				{
+					$index = sizeof($block[$name]) - 1;
+				}
+				else
+				{
+					$index = min((int) substr($blocks[$i], $pos + 1, -1), sizeof($block[$name]) - 1);
+				}
+			}
+			else
+			{
+				$name = $blocks[$i];
+				$index = sizeof($block[$name]) - 1;
+			}
+			if (!isset($block[$name]))
+			{
+				return false;
+			}
+			$block = $block[$name];
+			if (!isset($block[$index]))
+			{
+				return false;
+			}
+			$block = $block[$index];
+		}
+
+		if (!isset($block[$blocks[$i]]))
+		{
+			return false;
+		}
+		$block = $block[$blocks[$i]]; // Traverse the last block
+
+		// Change key to zero (change first position) if false and to last position if true
+		if ($key === false || $key === true)
+		{
+			return ($key === false) ? 0 : sizeof($block) - 1;
+		}
+
+		// Get correct position if array given
+		if (is_array($key))
+		{
+			// Search array to get correct position
+			list($search_key, $search_value) = @each($key);
+			foreach ($block as $i => $val_ary)
+			{
+				if ($val_ary[$search_key] === $search_value)
+				{
+					return $i;
+				}
+			}
+		}
+
+		return (is_int($key) && ((0 <= $key) && ($key < sizeof($block)))) ? $key : false;
+	}
+
+	/**
 	* Change already assigned key variable pair (one-dimensional - single loop entry)
 	*
 	* An example of how to use this function:
@@ -365,15 +448,15 @@ class context
 		if ($mode == 'insert')
 		{
 			// Make sure we are not exceeding the last iteration
-			if ($key >= sizeof($this->tpldata[$blockname]))
+			if ($key >= sizeof($block))
 			{
-				$key = sizeof($this->tpldata[$blockname]);
-				unset($this->tpldata[$blockname][($key - 1)]['S_LAST_ROW']);
+				$key = sizeof($block);
+				unset($block[($key - 1)]['S_LAST_ROW']);
 				$vararray['S_LAST_ROW'] = true;
 			}
 			else if ($key === 0)
 			{
-				unset($this->tpldata[$blockname][0]['S_FIRST_ROW']);
+				unset($block[0]['S_FIRST_ROW']);
 				$vararray['S_FIRST_ROW'] = true;
 			}
 
diff --git a/phpBB/phpbb/template/template.php b/phpBB/phpbb/template/template.php
index 041ecb12e4..9e3d658ca8 100644
--- a/phpBB/phpbb/template/template.php
+++ b/phpBB/phpbb/template/template.php
@@ -173,6 +173,23 @@ interface template
 	public function alter_block_array($blockname, array $vararray, $key = false, $mode = 'insert');
 
 	/**
+	* Find the index for a specified key in the innermost specified block
+	*
+	* @param	string	$blockname	the blockname, for example 'loop'
+	* @param	mixed	$key		Key to search for
+	*
+	* array: KEY => VALUE [the key/value pair to search for within the loop to determine the correct position]
+	*
+	* int: Position [the position to search for]
+	*
+	* If key is false the position is set to 0
+	* If key is true the position is set to the last entry
+	*
+	* @return mixed false if not found, index position otherwise; be sure to test with ===
+	*/
+	public function find_key_index($blockname, $key);
+
+	/**
 	* Get path to template for handle (required for BBCode parser)
 	*
 	* @param string $handle Handle to retrieve the source file
diff --git a/phpBB/phpbb/template/twig/extension.php b/phpBB/phpbb/template/twig/extension.php
index 3a983491b9..d5b14129b5 100644
--- a/phpBB/phpbb/template/twig/extension.php
+++ b/phpBB/phpbb/template/twig/extension.php
@@ -169,8 +169,7 @@ class extension extends \Twig_Extension
 		$args = func_get_args();
 		$key = $args[0];
 
-		$context = $this->context->get_data_ref();
-		$context_vars = $context['.'][0];
+		$context_vars = $this->context->get_root_ref();
 
 		if (isset($context_vars['L_' . $key]))
 		{