How to Fix 'PHP Fatal error: Failed opening required file' Error Using $_SERVER['DOCUMENT_ROOT']?

Understanding "PHP Fatal error: Failed opening required file" Error

The "PHP Fatal error: require_once(): Failed opening required file" error indicates an issue with accessing a required file in a PHP script. To resolve this issue, we need to understand the difference between virtual server paths and filesystem paths.

Virtual Server vs. Filesystem Paths

In the error message, the path to the required file "/common/configs/config_templates.inc.php" is a virtual server path that exists on the HTTP server. However, the filesystem path, where the file is actually located, is different. It should be "/home/viapics1/public_html/common/configs/config_templates.inc.php".

Document Root and Path Resolution

Web servers define a "Document root" variable that connects the virtual HTTP server to the actual filesystem path. This variable allows PHP to resolve relative virtual server paths to absolute filesystem paths.

Solution: Using $_SERVER['DOCUMENT_ROOT']

To fix the error, you can modify your PHP code to use $_SERVER['DOCUMENT_ROOT'] variable to calculate the absolute path to the required file:

require_once $_SERVER['DOCUMENT_ROOT'].'/common/configs/config_templates.inc.php';

This solution will ensure that the script can access the required file from any location within the document root.

Additional Resources

For a more detailed explanation of relative and absolute paths in PHP, you can refer to the article "An Absolute Guide to Relative and Absolute Paths in PHP" on the author's website.

The above is the detailed content of How to Fix 'PHP Fatal error: Failed opening required file' Error Using $_SERVER['DOCUMENT_ROOT']?. For more information, please follow other related articles on the PHP Chinese website!