在PHP中测试404的URL的简便方法？

function check_404($url) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_exec($ch);
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return $http_code == 404;
}

$url = "https://example.com/non_existent_page";
if (check_404($url)) {
    echo "URL返回404错误";
} else {
    echo "URL未返回404错误";
}