What measures can be taken to restrict user access to specific directories within a PHP script to prevent unauthorized access?

To restrict user access to specific directories within a PHP script and prevent unauthorized access, you can use PHP's built-in functions like `basename()` or `realpath()` to check the requested file paths against a list of allowed directories. Additionally, you can use session variables or user authentication to verify the user's identity before granting access to the directories. 

<?php
$allowed_directories = ['/path/to/allowed_directory1', '/path/to/allowed_directory2'];
$user_directory = $_GET['directory'];

if (in_array(realpath($user_directory), $allowed_directories)) {
    // User has access to the requested directory
    // Proceed with the script logic
} else {
    // Unauthorized access
    echo "Unauthorized access!";
    // You can redirect the user or display an error message
}
?>

Keywords

PHP directory access control authentication authorization security measures

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