$key = "01234567891234560123456789123456";
$iv = "0123456789123456";
//原本的 mcrypt 加密
$en_data = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, "0123456789123456", MCRYPT_MODE_CBC, $iv));
var_dump("mcrypt_encrypt:");
var_dump(bin2hex(base64_decode($en_data)));
var_dump($en_data);
$de_data = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($en_data), MCRYPT_MODE_CBC, $iv);
var_dump("mcrypt_decrypt:");
var_dump($de_data);
//OpenSSL 加密
$en_data = base64_encode(openssl_encrypt("0123456789123456", "aes-128-cbc", $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv));
var_dump("openssl_encrypt:");
var_dump(bin2hex(base64_decode($en_data)));
var_dump($en_data);
$de_data = openssl_decrypt(base64_decode($en_data), "aes-128-cbc", $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv);
var_dump("openssl_decrypt:");
var_dump($de_data);
var_dump(openssl_error_string());

string 'mcrypt_encrypt:' (length=15)
string '098edde21e92cbc01078469509f877de' (length=32)
string 'CY7d4h6Sy8AQeEaVCfh33g==' (length=24)
string 'mcrypt_decrypt:' (length=15)
string '0123456789123456' (length=16)
string 'openssl_encrypt:' (length=16)
string '434b1b1eb39024f270672bcd16bfe7f9' (length=32)
string 'Q0sbHrOQJPJwZyvNFr/n+Q==' (length=24)
string 'openssl_decrypt:' (length=16)
string '0123456789123456' (length=16)
string 'error:0607A082:digital envelope routines:EVP_CIPHER_CTX_set_key_length:invalid key length' (length=89)

$en_data = base64_encode(openssl_encrypt("0123456789123456", "aes-256-cbc", $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv)); 
var_dump($en_data); 
$de_data = openssl_decrypt(base64_decode($en_data), "aes-256-cbc", $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv); 
var_dump($de_data);