What does the __file__ attribute mean in php mysql

In PHP MySQL, the __file__ attribute refers to the path where the current php file is located. This attribute can help us control the file path more accurately when writing PHP scripts, thereby better managing file resources.

In PHP, the __file__ attribute is usually used as a way to locate file paths in programs. In some cases, we need to get the absolute path of the current PHP file. In this case, we can use file to get the path of the current file.

Using the file attribute to get the path of the current script is very simple, just use __file__ in the PHP file. For example:

$current_dir = dirname(__FILE__);

In the above code, the dirname() function is used to get the directory name of file, so that we can get the directory where the current PHP file is located . This makes it very convenient to reference other files in the same directory.

In addition to file__, there are other similar properties and functions that can get the path of the current script, such as $_SERVER['SCRIPT_FILENAME'] and realpath() Function, etc., but __file is the simplest and safest way.

In short, in PHP MySQL, the __file__ attribute refers to the absolute path of the current PHP file. It is a simple and convenient way to obtain the file path. We can apply it to our PHP development to Better manage file resources.

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