Random Hash

<?php
class Toolbox
{
	/**
	 * generate a fully random hash code
	 * randomly chooses md5 or sha1
	 *
	 * @return string
	 */
	static public function createHash()
	{
		$string = '';
		$alphaL = range('a', 'z');
		$alphaU = range('A', 'Z');
		$num = range('0', '9');
		$special = str_split('!@#$%^&*()_+-=[]{}:;a\'"?/.>,<\\`~ |¤½¼½¾¥’‘');

		for($i = 0; $i < rand(16, 32); $i++) {
			$choose = rand(0, 3);
			switch($choose) {
				case 0:
					$string .= $alphaL[array_rand($alphaL)];
					break;
				case 1:
					$string .= $alphaU[array_rand($alphaU)];
					break;
				case 2:
					$string .= $num[array_rand($num)];
					break;
				case 3:
					$string .= $special[array_rand($special)];
					break;
			}
		}

		switch(rand(0, 1)) {
			case 0: return md5($string . time()); break;
			case 1: return sha1($string . time()); break;
		}
	}
}
?>