php加密解密

<?php
function encrypt($input, $secureKey = '') {
	return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $secureKey, $input, MCRYPT_MODE_ECB, mcrypt_create_iv(32)));
}

function decrypt($input, $secureKey = '') {
	return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $secureKey, base64_decode($input), MCRYPT_MODE_ECB, mcrypt_create_iv(32)));
}

$key = 'jEP0rqTnYZjC4XrqVGqPWqK91zBThVgRyXUOXZPFZ2ZP905D2c3Qqtolfbk0cAzY';
$key = hash('sha256', $key, true);

$string = '小陳是一名應屆畢業生。';
$encode_string = encrypt($string, $key);
echo 'ENCODE: ' . $encode_string . '<br />';
echo 'DECODE: ' . decrypt($encode_string, $key) . '<br />';