function refund_decrypt($str, $key)
{
$key = md5($key);
$str = base64_decode($str);
$str = openssl_decrypt($str,‘aes-256-ecb‘,$key,OPENSSL_RAW_DATA);
$len = strlen($str);
$pad = ord($str[$len - 1]);
return substr($str, 0, strlen($str) - $pad);
}
原文：https://www.cnblogs.com/JANCHAN/p/10808442.html