php get_headers是判断网站是否正常的好方法? [英] php get_headers a good way to tell if a site is up?

问题描述

我对php还是很陌生，您能评论一下下面的代码是否可以很好地判断一个网站是否正常运行，以及它是否不合适，以及为什么使用更好的替代方法?

I'm still fairly new to php, can you comment on whether the code below is any good to tell if a site is up or down and if it might not be suitable the reasons why and better altneratives?

谢谢.

$siteHeader = @get_headers($url , 1);
if ($siteHeader > 1) {
    $siteUp = true;
} else {
    $siteUp = false;
}

推荐答案

我使用curl，但那只是我:

i use curl, but thats just me:

function check($url, $ignore = '')
{
    $agent = "Mozilla/4.0 (B*U*S)";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, $agent);

    curl_setopt($ch, CURLOPT_VERBOSE, false);
    curl_setopt($ch, CURLOPT_TIMEOUT, 45);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 45);

    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_NOBODY, true);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_MAXREDIRS, 5); //follow up to 10 redirections - avoids loops


    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); //fix for certificate issue
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); //fix for certificate issue


    $page = curl_exec($ch);
    $err = curl_error($ch);
    $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    $codes = array(
        0 => 'Domain Not Found',
        100 => 'Continue',
        101 => 'Switching Protocols',
        200 => 'OK',
        201 => 'Created',
        202 => 'Accepted',
        203 => 'Non-Authoritative Information',
        204 => 'No Content',
        205 => 'Reset Content',
        206 => 'Partial Content',
        300 => 'Multiple Choices',
        301 => 'Moved Permanently',
        302 => 'Found',
        303 => 'See Other',
        304 => 'Not Modified',
        305 => 'Use Proxy',
        307 => 'Temporary Redirect',
        400 => 'Bad Request',
        401 => 'Unauthorized',
        402 => 'Payment Required',
        403 => 'Forbidden',
        404 => 'Not Found',
        405 => 'Method Not Allowed',
        406 => 'Not Acceptable',
        407 => 'Proxy Authentication Required',
        408 => 'Request Timeout',
        409 => 'Conflict',
        410 => 'Gone',
        411 => 'Length Required',
        412 => 'Precondition Failed',
        413 => 'Request Entity Too Large',
        414 => 'Request-URI Too Long',
        415 => 'Unsupported Media Type',
        416 => 'Requested Range Not Satisfiable',
        417 => 'Expectation Failed',
        500 => 'Internal Server Error',
        501 => 'Not Implemented',
        502 => 'Bad Gateway',
        503 => 'Service Unavailable',
        504 => 'Gateway Timeout',
        505 => 'HTTP Version Not Supported'
    );

    $httpcode_out = 'http: ' . $httpcode . ' (' . $codes[$httpcode] . ')';
    $err = 'curl error: ' . $err;

    $out = array(
        $url,
        $httpcode_out,
        $err
    );

    if ($httpcode >= 200 && $httpcode < 307)
    {//good
        return array(
            'Work',
            $out
        );
    }
    else
    {//BAD
        return array(
            'Fail',
            $out
        );
    }
}

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