2 files changed, 9 insertions, 7 deletions
diff --git a/phpBB/includes/captcha/captcha_gd.php b/phpBB/includes/captcha/captcha_gd.php
index 3d64cb1c26..c513c45fe7 100644
--- a/phpBB/includes/captcha/captcha_gd.php
+++ b/phpBB/includes/captcha/captcha_gd.php
@@ -19,7 +19,7 @@ class captcha
 	var $width = 360;
 	var $height = 96;
 
-	function execute($code)
+	function execute($code, $seed)
 	{
 		global $config;
 		$stats = gd_info();
@@ -48,6 +48,9 @@ class captcha
 			imageantialias($image, true);
 		}
 
+		// seed the random generator
+		mt_srand($seed);
+
 		// set background color
 		$back =  imagecolorallocate($image, mt_rand(224, 255), mt_rand(224, 255), mt_rand(224, 255));
 		imagefilledrectangle($image, 0, 0, $this->width, $this->height, $back);
@@ -79,7 +82,7 @@ class captcha
 				$x		= mt_rand(0, 360);
 				$y		= mt_rand(0, (int)($this->height - ($size / 5)));
 				$color	= $func2($image, mt_rand(160, 224), mt_rand(160, 224), mt_rand(160, 224));
-				$text	= $chars_allowed[array_rand($chars_allowed)];
+				$text	= $chars_allowed[mt_rand(0, sizeof($chars_allowed) - 1)];
 				imagettftext($image, $size, $angle, $x, $y, $color, $this->get_font(), $text);
 			}
 			unset($chars_allowed);
@@ -145,7 +148,7 @@ class captcha
 			closedir($dr);
 		}
 
-		return $fonts[array_rand($fonts)];
+		return $fonts[mt_rand(0, sizeof($fonts) - 1)];
 	}
 }
 
diff --git a/phpBB/includes/captcha/captcha_non_gd.php b/phpBB/includes/captcha/captcha_non_gd.php
index 41bd22868e..bb4e5af443 100644
--- a/phpBB/includes/captcha/captcha_non_gd.php
+++ b/phpBB/includes/captcha/captcha_non_gd.php
@@ -30,15 +30,14 @@ class captcha
 	}
 
 	/**
-	* Create the image containing $code
+	* Create the image containing $code with a seed of $seed
 	*/
-	function execute($code)
+	function execute($code, $seed)
 	{
 		$img_height = $this->height - 10;
 		$img_width = 0;
 
-		list($usec, $sec) = explode(' ', microtime()); 
-		mt_srand($sec * $usec);
+		mt_srand($seed);
 
 		$char_widths = $hold_chars = array();
 		$code_len = strlen($code);