How can file permissions be adjusted to ensure proper functioning of scripts on a server with restrictive settings?

File permissions can be adjusted by using the chmod function in PHP to ensure proper functioning of scripts on a server with restrictive settings. This function allows you to change the permissions of a file or directory to allow the necessary access for the script to run successfully.

// Set the file permissions to allow read, write, and execute for the owner, and read and execute for others
chmod("path/to/file", 0755);