<?php
$a = 123456;
echo md5('prashant', $a);
echo "<br>";
$b = 123456;
echo md5('prashant', $b);
echo "<br>";
echo "Hi"; exit;

$plaintext = '{"FirstName":"Prashnat Kumar","Email":"prashant@catpl.co.in","City":"Noida","PinCode":"206245","MobileNo":"9015562063","Comment":""}';
$password = 'casa@2018';
$method = 'aes-256-cbc';

// Must be exact 32 chars (256 bit)
$password = substr(hash('sha256', $password, true), 0, 32);
 "Password:" . $password . "\n";

// IV must be exact 16 chars (128 bit)
$iv = chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0);

// av3DYGLkwBsErphcyYp+imUW4QKs19hUnFyyYcXwURU=
$encrypted = base64_encode(openssl_encrypt($plaintext, $method, $password, OPENSSL_RAW_DATA, $iv));

// My secret message 1234
$decrypted = openssl_decrypt(base64_decode($encrypted), $method, $password, OPENSSL_RAW_DATA, $iv);

echo 'plaintext=' . $plaintext . "<br />";
echo 'cipher=' . $method . "<br />";
echo 'encrypted to: ' . $encrypted . "<br />";
echo 'decrypted to: ' . $decrypted . "<br />";

exit;