openssl_encrypt openssl_decrypt in php

openssl_encrypt openssl_decrypt in php

$method = 'aes-128-ecb';
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($method));
$msg="Hi this is the testing for encoding and decoding";

$en=openssl_encrypt($msg, $method, 'def', true, $iv);
echo $en;

$de=openssl_decrypt($en, $method, 'def', true, $iv);
echo $de;