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How to Resolve PHP Fatal Error: require() Failed to Open 'data/tdk.php'

M66 2025-07-18

PHP Fatal Error: require() Failed to Open File

In PHP development, you might encounter an error message like the following:

fatal error: require(): Failed opening required 'data/tdk.php' (include_path='.;C:\php\pear')

This error typically appears in the PHP header section, indicating that PHP cannot load the required file. The root cause is often that PHP cannot find the correct file path or the file doesn't exist.

How to Resolve PHP Fatal Error

To fix this error, we can follow these steps to troubleshoot:

Check File Path

First, confirm that the file path is correct. If the path is incorrect, PHP will fail to locate the file and throw the error. When using relative paths, make sure the path is correct relative to the current script’s directory. For absolute paths, ensure the full path correctly points to the file's location.

Check File Name and Extension

The file name and extension must exactly match the actual file. Any typo in the name or mismatched extension will prevent PHP from loading the file.

Check File Permissions

If the file permissions are incorrect, PHP won't be able to access it. Ensure that the file has read permissions set properly. You can use the chmod command to modify the file permissions and make it readable.

Confirm File Existence

Finally, verify that the file exists in the specified path. If the file is missing or has been deleted, PHP will not be able to load it and will throw the error. Make sure the file is actually present in the correct folder.

Conclusion

Fixing PHP fatal errors typically requires thorough checking of the file path, file name, permissions, and file existence. Once you’ve resolved these issues, PHP should be able to load the required file without any problems.