Added test for those different crypt() methods. Hopefully I got the results right.

ext/standard/tests/strings/crypt.phpt

@@ -0,0 +1,26 @@
+--TEST--
+crypt() function
+--FILE--
+<?php
+
+$str = 'rasmuslerdorf';
+$salt1 = 'rl';
+$res_1 = 'rl.3StKT.4T8M';
+$salt2 = '_J9..rasm';
+$res_2 = '_J9..rasmBYk8r9AiWNc';
+$salt3 = '$1$rasmusle$';
+$res_3 = '$1$rasmusle$rISCgZzpwk3UhDidwXvin0';
+$salt4 = '$2a$07$rasmuslerd............';
+$res_4 = '$2a$07$rasmuslerd............nIdrcHdxcUxWomQX9j6kvERCFjTg7Ra';
+
+echo (CRYPT_STD_DES)  ? ((crypt($str, $salt1) === $res_1) ? 'STD' : 'STD - ERROR') : 'STD', "\n";
+echo (CRYPT_EXT_DES)  ? ((crypt($str, $salt2) === $res_2) ? 'EXT' : 'EXT - ERROR') : 'EXT', "\n";
+echo (CRYPT_MD5)      ? ((crypt($str, $salt3) === $res_3) ? 'MD5' : 'MD5 - ERROR') : 'MD5', "\n";
+echo (CRYPT_BLOWFISH) ? ((crypt($str, $salt4) === $res_4) ? 'BLO' : 'BLO - ERROR') : 'BLO', "\n";
+
+?>
+--EXPECT--
+STD
+EXT
+MD5
+BLO