PHP Exercises : Get the document root directory as defined in the server's configuration file

Last update on April 19 2025 11:50:47 (UTC/GMT +8 hours)

25. Get Document Root Directory

Write a PHP script to get the document root directory under which the current script is executing, as defined in the server's configuration file.

Sample Solution:

PHP Code:

<?php
// getenv() gets the value of an environment variable named 'DOCUMENT_ROOT'
$rd = getenv('DOCUMENT_ROOT');

// Echo the value of the 'DOCUMENT_ROOT' environment variable
echo $rd . "\n";
?>

Explanation:

• Get Environment Variable:
• The getenv('DOCUMENT_ROOT') function retrieves the value of the environment variable named DOCUMENT_ROOT. This variable typically contains the root directory of the web server where the current script is running.
• Store Value:
• The retrieved value is stored in the variable $rd.
• Output the Document Root:
• The echo statement outputs the value of $rd, which represents the document root directory, followed by a newline (\n).

Output:

I:/Ampps/www

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP script to verify the document root directory and compare it against a configured path.
• Write a PHP script to extract the document root directory and list its immediate subdirectories.
• Write a PHP script to validate directory permissions in the document root and output a security status report.
• Write a PHP script to generate an HTML summary of the document root’s content structure and access rights.

PHP Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a PHP script to get the name of the owner of the current PHP script.
Next: Write a PHP script to get the information about the operating system PHP is running on.