PHP: Random Password

gistfile1.php

<?php

	function randomPassword($length = 8) {
	
		$password = false;
	
		$characters = 'abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789';
		$charsLength = strlen($characters) - 1;
	
		for ($i = 0; $i < $length; $i++) {
			$n = rand(0, $charsLength);
			$password .= $characters[$n];
		}
	
		return $password;
	
	}