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1function encrypt_decrypt($action, $string) {
2    $output = false;
3
4    $encrypt_method = "AES-256-CBC";
5    $secret_key = 'This is my secret key';
6    $secret_iv = 'This is my secret iv';
7
8    // hash
9    $key = hash('sha256', $secret_key);
10
11    // iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
12    $iv = substr(hash('sha256', $secret_iv), 0, 16);
13
14    if( $action == 'encrypt' ) {
15        $output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
16        $output = base64_encode($output);
17    }
18    else if( $action == 'decrypt' ){
19        $output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
20    }
21
22    return $output;
23}
24
25$plain_txt = "This is my plain text";
26echo "Plain Text = $plain_txtn";
27
28$encrypted_txt = encrypt_decrypt('encrypt', $plain_txt);
29echo "Encrypted Text = $encrypted_txtn";
30
31$decrypted_txt = encrypt_decrypt('decrypt', $encrypted_txt);
32echo "Decrypted Text = $decrypted_txtn";
33
34if( $plain_txt === $decrypted_txt ) echo "SUCCESS";
35else echo "FAILED";
36
37echo "n";