OpenSSL Encryption/Decryption

<?php
$data = "hello! this is a test!";
$method = 'aes-256-cbc';
$key = '59b6ab46d379b89d794c87b74a511fbd59b6ab46d379b89d794c87b74a511fbd';
$iv = '0aaff094b6dc29742cc98a4bac8bc8f9';

$e = openssl_encrypt( $data, $method, hex2bin( $key ), 0, hex2bin( $iv ));

echo 'Ciphertext: [', bin2hex( base64_decode( $e )), "]\n";
echo 'Key:        [', $key, "]\n";
echo 'Cleartext:  [', openssl_decrypt( $e, $method, hex2bin( $key ), 0, hex2bin( $iv )), "]\n";

// Test with openssl on the command line as well, just to be sure!
file_put_contents( 'clear.txt', $data );

$exec = "openssl enc -$method -e -in clear.txt -out encrypted.txt -base64 -nosalt -K $key -iv $iv";
exec ($exec);
$out = file_get_contents( 'encrypted.txt' );
echo 'Ciphertext: [', bin2hex( base64_decode(trim($out))), "]\n";