<?php
/**
 * psl, password security level function,
 *	checks security level of a password.
 *
 *	psl(&$password:String):UInt32
 *
 * @param	String		generic password by reference
 * @return	UInt32		security level from 0 to 3
 * ------------------------------------------
 * Security Level Values
 *
 *	0	You shouldn't allow this kind of passwords
 *	1	Low Security, less than 5 seconds with a brute force
 *	2	Medium Security, should be good enought
 *	3	High Security, really difficult to brute force
 * ------------------------------------------
 * @author		Andrea Giammarchi
 * @site		http://www.devpro.it/
 * @date		2006 / 11 / 13
 * @version		1.1
 * @compatibility	PHP >= 4
 */
function psl(&$pwd){
	$match = create_function('$reg, &$pwd', 'return preg_match($reg, $pwd);');
	$length = strlen($pwd);
	$level = 0;
	if($length > 5) {
		$level = 1;
		if($length > 6) {
			if($match('/[a-z]/', $pwd) && $match('/[A-Z]/', $pwd) && $match('/[0-9]/', $pwd))
				$level = 3;
			else if(
				($match('/[a-z]/', $pwd) && ($match('/[A-Z]/', $pwd) || $match('/[0-9]/', $pwd))) ||
				($match('/[0-9]/', $pwd) && ($match('/[A-Z]/', $pwd) || $match('/[a-z]/', $pwd))) ||
				($match('/[A-Z]/', $pwd) && ($match('/[a-z]/', $pwd) || $match('/[0-9]/', $pwd)))
			)
				$level = $match('/[\x20-\x2F]|[\x3A-\x40]|[\x5b-\x60]|[\x7B-\xFF]/', $pwd) ? 3 : 2;
		};
	};
	return $level;
};
?>