Create a password rating

gistfile1.php

<?php

/**
 	* test - score: 4
	* tESt - score: 4
	* TeSt - score: 4
	* TeS342 - score: 12
	* T34@$sTD - score: 72
	* :saR%8jmc9UjeK - score: 504
 */
public function get_password_score($password, $requirement = 30, $min_characters = 8)
{
	$uppercase_score = (($strength = strlen(preg_replace('/[^A-Z]/', '', $password)) * 1) > 0 ? $strength : 1);
	$lowercase_score = (($strength = strlen(preg_replace('/[^a-z]/', '', $password)) * 1) > 0 ? $strength : 1);
	$numeric_score   = (($strength = strlen(preg_replace('/[^0-9]/', '', $password)) * 2) > 0 ? $strength : 1);
	$character_score = (($strength = strlen(preg_replace('/[a-zA-Z0-9]/', '', $password)) * 3) > 0 ? $strength : 1);

	$total_score = $lowercase_score * $uppercase_score * $numeric_score * $character_score;

	if (strlen($password) < $min_characters && $total_score > $requirement)
		return ($requirement - 1); // push them towards more characters by not going over the minimum

	return $total_score;
}