What are the potential challenges of managing file permissions in PHP scripts on a Linux server?

One potential challenge of managing file permissions in PHP scripts on a Linux server is ensuring that the script has the necessary permissions to read, write, or execute files as required. This can be particularly challenging when dealing with shared hosting environments where file ownership and permissions may be restricted. To address this issue, it is important to set the correct file permissions on the server and ensure that the PHP script is executed with the appropriate user permissions.

// Set the correct file permissions on a file
chmod("/path/to/file.txt", 0644);