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1<?php
2
3function dec_enc($action, $string) {
4    $output = false;
5
6    $encrypt_method = "AES-256-CBC";
7    $secret_key = 'This is my secret key';
8    $secret_iv = 'This is my secret iv';
9
10    // hash
11    $key = hash('sha256', $secret_key);
12    
13    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
14    $iv = substr(hash('sha256', $secret_iv), 0, 16);
15
16    if( $action == 'encrypt' ) {
17        $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
18        $output = base64_encode($output);
19    }
20    else if( $action == 'decrypt' ){
21        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
22    }
23
24    return $output;
25}