How can PHP developers ensure that only authorized files are included when using dynamic file inclusion based on user input?

To ensure that only authorized files are included when using dynamic file inclusion based on user input, PHP developers can create a whitelist of allowed files and validate the user input against this whitelist before including the file. 

$allowed_files = ['file1.php', 'file2.php', 'file3.php']; // Whitelist of allowed files

$user_input = $_GET['file']; // User input for file inclusion

if (in_array($user_input, $allowed_files)) {
    include($user_input);
} else {
    echo "Unauthorized file inclusion attempt!";
}

Keywords

PHP dynamic file inclusion user input security authorization

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