What are the potential risks or security concerns associated with trying to access and modify PHP source files?

Potential risks or security concerns associated with trying to access and modify PHP source files include introducing vulnerabilities such as injection attacks, allowing unauthorized access to sensitive information, and compromising the integrity of the codebase. To mitigate these risks, it is essential to implement proper file permissions, input validation, and secure coding practices.

// Example of implementing file permissions to restrict access to PHP source files
chmod("/path/to/source/file.php", 0644);