Unused variable declaration in your code about cryptojs-aes-php HOT 4 CLOSED

<?php

/**
 * Helper library for CryptoJS AES encryption/decryption
 * Allow you to use AES encryption on client side and server side vice versa
 *
 * @author BrainFooLong (bfldev.com)
 * @link https://github.com/brainfoolong/cryptojs-aes-php
 */

/**
 * Decrypt data from a CryptoJS json encoding string
 *
 * @param mixed $passphrase
 * @param mixed $decrypted
 * @return mixed
 */
function cryptoJsAesDecrypt($decrypted, $passphrase)
{
    list ($decstr, $comb) = explode("*", $decrypted);
    $decstrf = $decstr;

    $combnorm = substr($comb, 0, 48);

    $cnarr = str_split($combnorm, 4);
    $s = $cnarr[0] . $cnarr[2] . $cnarr[4] . $cnarr[6];
    $ivr = $cnarr[1] . $cnarr[3] . $cnarr[5] . $cnarr[7] . $cnarr[8] . $cnarr[9] . $cnarr[10] . $cnarr[11];

    try
    {
        $salt = hex2bin($s);
        $iv = hex2bin($ivr);
    }
    catch (Exception $e)
    {
        return $combnorm;
    }
    $ct = base64_decode($decstrf);
    $concatedPassphrase = $passphrase . $salt;
    $md5 = array();
    $md5[0] = md5($concatedPassphrase, true);
    $result = $md5[0];
    for ($i = 1; $i < 3; $i ++)
    {
        $md5[$i] = md5($md5[$i - 1] . $concatedPassphrase, true);
        $result .= $md5[$i];
    }
    $key = substr($result, 0, 32);
    $data = openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
    if ($data == FALSE)
    {
        return "passphrase:" . $passphrase;
    }
    else
    {
        return json_decode($data, true);
    }

    //return json_decode($data, true);
}

/**
 * Encrypt value to a cryptojs compatiable json encoding string
 *
 * @param mixed $passphrase
 * @param mixed $value
 * @return string
 */
function cryptoJsAesEncrypt($passphrase, $value, $map_id)
{
    $salt = openssl_random_pseudo_bytes(8);
    $salted = '';
    $dx = '';
    while (strlen($salted) < 48)
    {
        $dx = md5($dx . $passphrase . $salt, true);
        $salted .= $dx;
    }
    $key = substr($salted, 0, 32);
    $iv = substr($salted, 32, 16);

    $s = str_split(bin2hex($salt), 4);
    $ivr = str_split(bin2hex($iv), 4);

    $comb = $s[0] . $ivr[0] . $s[1] . $ivr[1] . $s[2] . $ivr[2] . $s[3] . $ivr[3] . $ivr[4] . $ivr[5] . $ivr[6] . $ivr[7];
    $map_iid = $map_id * hexdec($s[0]);

    $encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv);
    $data = array(
        "ct" => base64_encode($encrypted_data) . "*" . $comb . $map_iid,
        "s" => $s,
        "ivr" => $ivr
    );
    return base64_encode($encrypted_data) . "*" . $comb . $map_iid;
}