Script root意思

"Script root" is a term used in web development, particularly in the context of server-side scripting languages like PHP. It refers to the directory from which a script is executed.

In PHP, the script root is the directory where the PHP file that is currently being executed resides. It is often used to refer to the directory where the web server looks for files when a URL is requested.

For example, if you have a PHP file named "index.php" located in the directory "httpdocs" on your server, and you access that file through the URL "http://example.com/index.php", then the script root would be the "httpdocs" directory.

The script root is important because it provides a reference point for relative paths in your scripts. For instance, if you want to include another file or access a resource like an image or a database file, you would use a path that is relative to the script root.

In PHP, you can get the script root by using the __DIR__ constant, which returns the directory where the calling file is located. If you want the absolute path to the script root, you can combine __DIR__ with the realpath() function to resolve the path to its true physical location on the server.