find the root directory of a directory in php

To find the root directory of a directory in PHP, you can use the realpath() function and keep moving up the directory structure until the root directory is reached.

Here's an example code snippet:

main.php
// Get the current directory path
$dir_path = realpath('./');

// Loop until the root directory is reached
while($dir_path != '/' && $dir_path != '\\'){
    $dir_path = dirname($dir_path);
}

// Output the root directory path
echo $dir_path;
242 chars
11 lines

This code uses the realpath() function to get the full path of the current directory, and then checks if it matches the root directory separator (/ for Unix-based systems and \\ for Windows). If not, it moves up to the parent directory using the dirname() function until the root directory is reached. Finally, it outputs the path of the root directory.

Note that this method assumes that the current directory is a subdirectory of the root directory. If you need to find the root directory of a specific path that is not necessarily a subdirectory of the current directory, you can replace the realpath('./') line with the absolute path of the directory you want to check.