AES 256 bit - decrypt in JS CrytoJS AES 256 and encrypt in PHP

/**
	* Decrypt data from a CryptoJS json encoding string
	*
	* @param mixed $passphrase
	* @param mixed $jsonString
	* @return mixed
	*/
	function cryptoJsAesDecrypt($passphrase, $jsonString){
	$jsondata = json_decode($jsonString, true);
	try {
	$salt = hex2bin($jsondata["s"]);
	$iv = hex2bin($jsondata["iv"]);
	} catch(Exception $e) { return null; }
	$ct = base64_decode($jsondata["ct"]);
	$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, $iv);
	return json_decode($data, true);
	}

/**
	* Encrypt value to a cryptojs compatiable json encoding string
	*
	* @param mixed $passphrase
	* @param mixed $value
	* @return string
	*/
	function cryptoJsAesEncrypt($passphrase, $value){
	$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);
	$encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv);
	$data = array("ct" => base64_encode($encrypted_data), "iv" => bin2hex($iv), "s" => bin2hex($salt));
	return json_encode($data);
	}

reference : https://github.com/brainfoolong/cryptojs-aes-php