Changing index.php or adding some new file on the root folder of project is not recommended.
Git can help you to customize your project on local instance without bothering any team members.


file .git/info/exclude

```
/index2.php
/test.php
```

edit index2.php line ~ 73-75
```php
// if (isset($_SERVER['MAGE_IS_DEVELOPER_MODE'])) {
    Mage::setIsDeveloperMode(true);
// }
```

edit magento config for nginx server, change all "index.php" to "index2.php".

add test.php for testing some feature easily, that is example file.
```php
<?php
error_reporting(E_ALL | E_STRICT);
define('MAGENTO_ROOT', getcwd());
require_once MAGENTO_ROOT . '/app/Mage.php';
Mage::setIsDeveloperMode(true);
ini_set('display_errors', 1);

umask(0);
Mage::app(1);
// Mage::run('', 'store');
$product = \Mage::getModel('catalog/product');
$product->load((int) $productId);

```