How can PHP scripts be used to control access to files based on user permissions?

To control access to files based on user permissions using PHP scripts, you can utilize PHP's built-in functions like file_exists() and is_readable() to check if a user has permission to access a file. You can also use session variables to store user permissions and compare them when accessing files. 

<?php
session_start();

// Check if user has permission to access a file
if ($_SESSION['user_permission'] == 'admin') {
    $file_path = '/path/to/file.txt';
    
    if (file_exists($file_path) && is_readable($file_path)) {
        // Allow user to access the file
        $file_content = file_get_contents($file_path);
        echo $file_content;
    } else {
        echo 'You do not have permission to access this file.';
    }
} else {
    echo 'You do not have permission to access this file.';
}
?>

Keywords

PHP file permissions access control user authentication authorization

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