// define access level constants define('ACCESS_DENIED', 0); define('ACCESS_READ_ONLY', 1); define('ACCESS_READ_WRITE', 2); // check user permission function checkPermission($userLevel) { if ($userLevel >= ACCESS_READ_WRITE) { return true; } else { return false; } } // usage example $isAuthorized = checkPermission(ACCESS_READ_WRITE); if ($isAuthorized) { // allow user to delete file } else { // deny access }This code defines access level constants, like ACCESS_DENIED, ACCESS_READ_ONLY, and ACCESS_READ_WRITE, where various types of users have different access levels. Then, the checkPermission() function is defined with a parameter $userLevel, which is associated with the corresponding access level constant. The function returns true if the user's access level is greater than or equal to ACCESS_READ_WRITE, indicating that the user can delete the file. Otherwise, the function returns false, indicating that the user cannot delete the file. This function could potentially be included in a package or library related to user authentication and authorization, such as Laravel Auth or Symfony Security.