Are there other attributes in PHP besides 0777 that restrict access to directories?

Yes, there are other attributes in PHP that can restrict access to directories. Some common attributes include 0644, 0755, and 0640. These attributes control the read, write, and execute permissions for the owner, group, and others. By setting appropriate permissions, you can restrict access to directories and files in a more secure manner.

// Set directory permissions to 0755 (owner has read, write, and execute permissions, group and others have read and execute permissions)
chmod("/path/to/directory", 0755);