diff --git a/htdocs/core/lib/ticket.lib.php b/htdocs/core/lib/ticket.lib.php
index 16b39354de9..25da4bdacfc 100644
--- a/htdocs/core/lib/ticket.lib.php
+++ b/htdocs/core/lib/ticket.lib.php
@@ -178,16 +178,16 @@ function showDirectPublicLink($object)
 /**
  *  Generate a random id
  *
- *  @param  int $car Length of string to generate key
+ *  @param  int 	$car 	Length of string to generate key
  *  @return string
  */
 function generate_random_id($car = 16)
 {
 	$string = "";
 	$chaine = "abcdefghijklmnopqrstuvwxyz123456789";
-	srand((double) microtime() * 1000000);
+	mt_srand((double) microtime() * 1000000);
 	for ($i = 0; $i < $car; $i++) {
-		$string .= $chaine[rand() % strlen($chaine)];
+		$string .= $chaine[mt_rand() % strlen($chaine)];
 	}
 	return $string;
 }
diff --git a/htdocs/opensurvey/fonctions.php b/htdocs/opensurvey/fonctions.php
index 3d8d76c5c1e..f844921720b 100644
--- a/htdocs/opensurvey/fonctions.php
+++ b/htdocs/opensurvey/fonctions.php
@@ -206,7 +206,7 @@ function getUrlSondage($id, $admin = false)
 /**
  * 	Generate a random id
  *
- *	@param	string	$car	Char to generate key
+ *	@param	int		$car	Length of string to generate key
  * 	@return	string
  */
 function dol_survey_random($car)