php aes-256-cbc required

encrypt_sample.php

<?php
	// encrypt
	$text = json_encode(array(
		'user' => 'username',
		'first' => 'firstname',
		'last' => 'lastname',
		'any_data' => '11212 12123312 132 3'
	));
	
    $key = 'zebc5adt0y345630gcj483bu3886ybz3';
    $algorithm = MCRYPT_RIJNDAEL_256;
    $mode = MCRYPT_MODE_CBC;
    $ivSize = mcrypt_get_iv_size($algorithm, $mode);

    $cryptKey = substr($key, 0, 32);

    $iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);

    // $result with '$$' as separator between IV and Cipherdata, and base64 
    $result =  base64_encode($iv . '$$' . mcrypt_encrypt($algorithm, $cryptKey, $text, $mode, $iv));

    // to decode 
    $data = base64_decode($data);
	$iv = substr($data, 0, $ivSize);
	$text = substr($data, $ivSize + 2);
	$plain = rtrim(mcrypt_decrypt($algorithm, $cryptKey, $text, $mode, $iv), "\0");
 
?>