/dev/null", $output, $return_var);         // Check it ran properly     if($return_var==0)     {         if(preg_match("/^.*\: ([^:]+)$/", $output[0], $matches))         {             // Check response             if(strtoupper($matches[1])=="OK")             {                 // Password is strong                 $message="";                 return(true);             }             else             {                 // Cracklib doesn't like it                 $message=$matches[1];                 return(false);             }         }         else         {             // Badly formatted response from cracklib-check.             throw new Exception("Didn't understand cracklib-check response.");         }     }     else     {         // Some sort of execution error         throw new Exception("Failed to run cracklib-check.");     } } ?>