Are there potential pitfalls in using $_SERVER['QUERY_STRING'] to handle query parameters in PHP, especially when multiple actions are involved?

Using $_SERVER['QUERY_STRING'] directly to handle query parameters in PHP can lead to security vulnerabilities such as SQL injection and cross-site scripting attacks. It's recommended to use a combination of functions like parse_str() to parse the query string and filter_input() to sanitize and validate the input parameters before using them in your application. 

$queryString = $_SERVER['QUERY_STRING'];
parse_str($queryString, $queryParams);

$action = filter_input(INPUT_GET, 'action', FILTER_SANITIZE_STRING);

if ($action === 'delete') {
    // Handle delete action
} elseif ($action === 'update') {
    // Handle update action
} else {
    // Handle default action
}

Keywords

$_SERVER['QUERY_STRING'] query parameters PHP multiple actions potential pitfalls

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