404 redirect checker

check for 404's in blog

/*
 * This piece of code checks to see if the 404ing URL exists under blog
 * if so, redirects to the page, if not render normal 404 page
 * */

$tmpUrl = "https://".$_SERVER["SERVER_NAME"]."/blog". $_SERVER["REQUEST_URI"];

//check for trailing slash
if(substr($tmpUrl, -1) == '/') {
	$tmpUrl = substr($tmpUrl, 0, -1);
}

//get headers and http status code
$headers = get_headers($tmpUrl);
$statusCode = substr($headers[0], 9, 3);

//WP will return 301 on pages that exist, 302 on pages that don't
if ($statusCode == "301" || $statusCode == "200"){
  Header("Location: ".$tmpUrl);
}

refactor with curl instead of get_header