CHECK-PASSWORD.PHP

Verifies that a given string is a good password. If it is a good password, the function returns an empty string. If it isn't, it returns a text string describing the flaws. The function is relatively permissive, but was written to take additional constraints.

<?
function Check_Password($password)
         {
         //Makes it easy to implement grammar rules.
         $password_flaws = array();

         $strlen = strlen($password);

         if($strlen <= 5)
            $password_flaws[sizeof($password_flaws)] = "too short";

         $count_chars = count_chars($password, 3);

         if(strlen($count_chars) < $strlen / 2)
            $password_flaws[sizeof($password_flaws)] = "too simple";

         //The function returns an empty string if the password is "good".
         $return_string = "";
         $sizeof = sizeof($password_flaws);

         for($index = 0; $index < $sizeof; $index++)
            {
            if($index == 0)
               $return_string .= "the password is ";

            if($index == $sizeof - 1 && $sizeof != 1)
               $return_string .= " and ";

            //this is in case i have more than 3 sources of error.
            if($index != 0 && $index != $sizeof - 1)
               $return_string .= ", ";

            $return_string .= $password_flaws[$index];
            }

         return($return_string);
         }
?>