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run code in 300+ PHP versions simultaneously
<?php $secret = 'a0a7e7997b6d5fcd55f4b5c32611b87c'; function encrypt128($str, $secret) { $block = 16; $pad = $block - (strlen($str) % $block); $str .= str_repeat(chr($pad), $pad); return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $secret, $str, MCRYPT_MODE_ECB)); } var_dump(encrypt128('small1', $secret));

preferences:
63.96 ms | 402 KiB | 5 Q