How can incorrect file permissions impact PHP and MySQL interactions in a web development project?

Incorrect file permissions can impact PHP and MySQL interactions in a web development project by causing errors when trying to access or modify files or databases. To solve this issue, you need to ensure that the files and directories have the correct permissions set so that PHP scripts can read, write, and execute them as needed.

// Set correct file permissions for a specific file
chmod("/path/to/file.php", 0644);