This solution is mostly based on Zend_Acl (c) Zend Technologies USA Inc. (http://www.zend.com), new BSD license
if (is_writable('myfile.txt')) { // code for writing to the file } else { echo 'File is not writable.'; }
chmod('/mydirectory', 0755);
session_start(); if (!$_SESSION['loggedin']) { header('Location: login.php'); exit; }This code checks whether the user is logged in, and if not, redirects them to the login page. Package/library: This code utilizes the PHP session functions which are part of the core PHP language. In conclusion, PHP permission-related code examples are often built-in PHP functions or session functions that restrict user access or grant access to resources. No package/library is required for these code examples.