How can PHP developers ensure the security of including files via GET parameters?

When including files via GET parameters in PHP, developers should validate and sanitize the input to prevent directory traversal attacks. One way to ensure security is by using a whitelist approach, where only specific files are allowed to be included based on predefined rules. 

// Whitelist of allowed files
$allowed_files = array(
    'file1.php',
    'file2.php'
);

// Get the file name from the GET parameter
$file_name = $_GET['file'];

// Check if the file is in the whitelist
if (in_array($file_name, $allowed_files)) {
    include($file_name);
} else {
    // Handle unauthorized access
    echo "Unauthorized access";
}

Keywords

PHP security include GET parameters validation

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