What are the potential issues with using the chmod function in PHP?

One potential issue with using the chmod function in PHP is that it can pose a security risk if not used carefully. Giving too many permissions to a file or directory can make it vulnerable to unauthorized access or modifications. To mitigate this risk, it is important to only grant the necessary permissions to files and directories.

// Set appropriate permissions for a file
$filename = 'example.txt';
$desired_permissions = 0644; // Read and write for owner, read for group and others
chmod($filename, $desired_permissions);