So i'm fixing my client's web that based on laravel. After i opened it, every controller and model look like this. For example this is one of model file from laravel.
<?php /* ucode version 1.0.0 */
$ucode = base64_decode("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");
ucode($ucode);
?>
In this code, there is a base64 code that will be decoded and a function named "ucode". I tried to find the information about this encryption and found nothing in the internet.
My PHP version is
PHP 5.6.17-pl0-gentoo (cli) (built: Feb 9 2016 01:24:30) Copyright (c) 1997-2015 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2015, by Zend Technologies
I tried to trace this "ucode" function and found that this function is built in with the PHP. i mean when tried to make a "test.php" file and call the ucode() in it, it is exist. also when i tried to redeclare ucode() function inside a blank php file, it returned an error because it is already declared.
So i want to ask if somebody know how this work. why the function is this encryption is included in PHP standart function?
