What are the differences between the owner of a PHP script file and the process user, and how does this affect setting directory permissions?

The owner of a PHP script file is the user who created the file, while the process user is the user running the PHP script. This affects setting directory permissions because the process user needs appropriate permissions to access the directory and execute the script. To ensure proper execution, the directory should have permissions set so that both the owner of the PHP script file and the process user have the necessary access rights.

// Set directory permissions to allow owner and process user access
chmod("/path/to/directory", 0755);