php script ดัก req 404 wordpress

ใช้กับไฟล์ index.php

$getcnt = file_get_contents("404.txt");
$content_url = $_SERVER["REQUEST_URI"]."\n".$getcnt;
$exp = explode("\n",$content_url);
$uniq = array_unique($exp);

$file = fopen('404.txt', 'w');
foreach ($uniq as $url) {
        if ($url != "") {
            fwrite($file, $url."\n");
        }
}
fclose($file);

ใช้กับไฟล์ 404.php ใน theme ที่ใช้

$block_array = array();
$geturl = file_get_contents("404.txt");
$exp = explode("\n",$geturl);

echo '<!--';
#print_r($exp);
echo '-->';

foreach ($exp as $url) {
        if (($_SERVER["REQUEST_URI"] == $url) && ($url != "") && ($url != "/")){
                http_response_code(404);
                echo 'Not found';
                echo '<meta http-equiv="refresh" content="5; url=/" />';
                exit();
        }
}