making sure a code is unique...

[mforan]

$info[130] is the random code, but how do i go about making sure the code is not used on any other row.... (even thou it would be unlikely even with this code, it is still possible)

 

<?php
# IF THE USER DOES NOT HAVE A UNIQUE CODE, CREATE ONE
if ($info[130] == "0") {
function randomPassword() {
  $salt = "abchefghjkmnpqrstuvwxyz0123456789";
  srand((double)microtime()*1000000);
	  $i = 0;
	  while ($i <= 14) {
			$num = rand() % 33;
			$tmp = substr($salt, $num, 1);
			$pass = $pass . $tmp;
			$i++;
	  }
	  return $pass;
}
$info[130] = randomPassword();
}
?>

[Zane]

Even though it IS highly unlikely you'll get two identical values with that function, you could still reinforce it by shuffling the salt.

 

Using this function str_shuffle

   function randomPassword() {
     $salt = str_shuffle("abchefghjkmnpqrstuvwxyz0123456789");

[mforan]

hmm thinking about it, wouldnt a while if true statement that loops if it keeps finding identical codes, then returns as found an empty code, work