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unique password|code generator

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  1. function generatePasswords( $howMany = 10, $length = 6, $allowedChars = NULL )
  2. {
  3. 	if (NULL == $allowedChars) {
  4. 		$allowedChars = 'abcdefghijklmnopqrstuvwxyz0123456789';
  5. 	}
  6. 	$allowedChars 	    = (string)$allowedChars;
  7. 	$allowedCharsLength = strlen( $allowedChars );
  8. 	$allowedCharsUpper  = strtoupper( $allowedChars );
  9.  
  10. 	$pwds   = array();
  11. 	$count = 0;
  12. 	while ($count < $howMany) {
  13. 		for ($j = $howMany - $count; $j--;) {
  14. 			$code   = '';
  15. 			for ($i = $length; $i--;) {
  16. 				$rand = mt_rand(0, $allowedCharsLength - 1);
  17. 				if ($rand % 2) {
  18. 					$code .= $allowedChars{$rand};
  19. 				} else {
  20. 					$code .= $allowedCharsUpper{$rand};
  21. 				}
  22. 			}
  23. 			$pwds[$code] = '';
  24. 		}
  25. 		$count = count( $pwds );
  26. 	}
  27. 	return array_keys( $pwds );
  28. }

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