php怎么判断http状态

header("HTTP/1.1 404 Not Found");

$url = "http://www.demo.com/preg.php"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, TRUE); curl_setopt($ch, CURLOPT_NOBODY, TRUE); // remove body curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); $head = curl_exec($ch); $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE); echo $httpCode; curl_close($ch);

404

echo '
'; print_r(get_headers("http://www.demo.com/preg.php",1));
        

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Array ( [0] => HTTP/1.1 404 Not Found [Date] => Fri, 28 Sep 2018 09:27:03 GMT [Server] => Apache/2.4.23 (Win32) OpenSSL/1.0.2j PHP/5.5.38 [X-Powered-By] => PHP/5.5.38 [Content-Length] => 0 [Content-Type] => text/html )