CSRF

   function simpleCrypt( $string, $action = 'e' ) {
        // you may change these values to your own
        $secret_key = 'my_simple_secret_key';
        $secret_iv = 'my_simple_secret_iv';

        $output = false;
        $encrypt_method = "AES-256-CBC";
        $key = hash( 'sha256', $secret_key );
        $iv = substr( hash( 'sha256', $secret_iv ), 0, 16 );

        if( $action == 'e' ) {
            $output = base64_encode( openssl_encrypt( $string, $encrypt_method, $key, 0, $iv ) );
        }
        else if( $action == 'd' ){
            $output = openssl_decrypt( base64_decode( $string ), $encrypt_method, $key, 0, $iv );
        }

        return $output;
    }

    //echo time();
   function encrypt(){
        date_default_timezone_set('GMT');
        $now = date('m/d/Y h:i:s a', time());

        $oneMoreHourFromNow = date('Y-m-d H:i',strtotime('+3 hour',strtotime($now)));
        $token = strtotime($oneMoreHourFromNow);
    //echo $timeFormat;

        return simpleCrypt($token, 'e');
   }
   function decrypt($token){
    return simpleCrypt($token, 'd');
   }