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<?php
function map_htmlspecialchars($request)
{
    return array_map(function ($value) {
        return is_array($value) ?
          map_htmlspecialchars($value) :
          htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
    }, $request);
}

$_GET = map_htmlspecialchars($_GET);
$_POST = map_htmlspecialchars($_POST);