- crypt: documentation ( source)
<?php
$setting = '$2y$04$';
$salt = '1234567890123456789012'; // SAME SALT FOR ALL PASSWORDS, OMG, DON'T
$str = '12345678901234567890123456789012345678901234567890123456789012345678901č';
$passwd1 = $str . 'A';
$passwd2 = $str . 'B';
$hash1 = crypt($passwd1, $setting . $salt);
$hash2 = crypt($passwd2, $setting . $salt);
echo ($hash1 === $hash2 ? 'same' : 'unique');