Encryption and Decryption in PHP

enc-dec-example.php

<?php
class mCode{
  protected function enc($string){
    $output = false;
		$encrypt_method = "AES-256-CBC";
		$secret_key = 'secret-key-1';
		$secret_iv = 'secret-key-2';
		$key = hash('sha256', $secret_key);
		$iv = substr(hash('sha256', $secret_iv), 0, 16);
		$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
		$output = base64_encode($output);
		return $output;
	}
	protected function dec($string){
		$output = false;
		$encrypt_method = "AES-256-CBC";
		$secret_key = 'secret-key-1';
		$secret_iv = 'secret-key-2';
		$key = hash('sha256', $secret_key);
		$iv = substr(hash('sha256', $secret_iv), 0, 16);
		$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
		return $output;
	}
}
?>