How can access rights and permissions affect the functionality of PHP scripts that require file access?

Access rights and permissions can affect the functionality of PHP scripts that require file access by restricting the ability of the script to read, write, or execute files. To ensure that PHP scripts have the necessary access rights, you can set the appropriate permissions on the files and directories that the script needs to access. This can be done using the chmod() function in PHP to set the permissions accordingly.

// Set the appropriate permissions on the file
chmod("example.txt", 0644);