php获取网页请求状态程序代码

网页返回状态代码很多站长会去查自己网站状态码是不是200或错误页面是不是404代码了,那么我们使用最多的查看方法就是使用站长工具或ff浏览器来查,但有很多朋友不知道可以自己写一个查看状态代码的功能.

方法一,使用 fsockopen,严重鄙视curl_getinfo,代码如下:

<?php
function get_http_code($url = "localhost", $port = 80, $fsock_timeout = 10) {
    set_time_limit(0);
    ignore_user_abort(true);
    // 记录开始时间
    list($usec, $sec) = explode(" ", microtime(true));
    $timer[&#39;start&#39;] = (float)$usec + (float)$sec;
    // 校验URL
    if (!preg_match("/^https?:\/\//i", $url)) {
        $url = "http://" . $url;
    }
    // 支持HTTPS
    if (preg_match("/^https:\/\//i", $url)) {
        $port = 443;
    }
    // 解析URL
    $urlinfo = parse_url($url);
    if (emptyempty($urlinfo[&#39;path&#39;])) {
        $urlinfo[&#39;path&#39;] = &#39;/&#39;;
    }
    $host = $urlinfo[&#39;host&#39;];
    $uri = $urlinfo[&#39;path&#39;] . (emptyempty($urlinfo[&#39;query&#39;]) ? &#39;&#39; : $urlinfo[&#39;query&#39;]);
    // 通过fsock打开连接
    if (!$fp = fsockopen($host, $port, $errno, $error, $fsock_timeout)) {
        list($usec, $sec) = explode(" ", microtime(true));
        $timer[&#39;end&#39;] = (float)$usec + (float)$sec;
        $usetime = (float)$timer[&#39;end&#39;] - (float)$timer[&#39;start&#39;];
        return array(
            &#39;code&#39; => - 1,
            &#39;usetime&#39; => $usetime
        );
    }
    // 提交请求
    $status = socket_get_status($fp);
    $out = "GET {$uri} HTTP/1.1\r\n";
    $out.= "Host: {$host}\r\n";
    $out.= "Connection: Close\r\n\r\n";
    $write = fwrite($fp, $out);
    if (!$write) {
        list($usec, $sec) = explode(" ", microtime(true));
        $timer[&#39;end&#39;] = (float)$usec + (float)$sec;
        $usetime = (float)$timer[&#39;end&#39;] - (float)$timer[&#39;start&#39;];
        return array(
            &#39;code&#39; => - 2,
            &#39;usetime&#39; => $usetime
        );
    }
    $ret = fgets($fp, 1024);
    preg_match("/http\/\d\.\d\s(\d+)/i", $ret, $m);
    $code = $m[1];
    fclose($fp);
    list($usec, $sec) = explode(" ", microtime(true));
    $timer[&#39;end&#39;] = (float)$usec + (float)$sec;
    $usetime = (float)$timer[&#39;end&#39;] - (float)$timer[&#39;start&#39;];
    return array(
        &#39;code&#39; => $code,
        &#39;usetime&#39; => $usetime
    );
}
?>

file_get_contents 是 fsockopen 功能的简单打包，效率稍低些，但是抓取成功率很高，所以在 snoopy 出问题的时候我一般那他来。5.0.0 添加了对 context 的支持，有了context，他也可以发送 header 信息，自定义用户 agent, referer, cookies 都不在话下。5.1.0 添加了 offset 和 maxlen 参数，可以只读文件的一部分内容。

方法二,使用snoopy.class.php

Snoopy是一个php类,用来模拟浏览器的功能,可以获取网页内容,发送表单,代码如下:

<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, &#39;http://www.spiegel.de/&#39;);
curl_setopt($ch, CURLOPT_RANGE, &#39;0-500&#39;);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
curl_close($ch);
echo $result;
/** 
 *But as noted before if the server doesn&#39;t honor this header but sends the whole file curl will download all of it. E.g. http://www.111cn.net ignores the header. But you can (in addition) set a write function callback and abort the request when more data is received, e.g.
 * php 5.3+ only
 * use function writefn($ch, $chunk) { ... } for earlier versions
 */
$writefn = function ($ch, $chunk) {
    static $data = &#39;&#39;;
    static $limit = 500; // 500 bytes, it&#39;s only a test
    $len = strlen($data) + strlen($chunk);
    if ($len >= $limit) {
        $data.= substr($chunk, 0, $limit - strlen($data));
        echo strlen($data) , &#39; &#39;, $data;
        return -1;
    }
    $data.= $chunk;
    return strlen($chunk);
};
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, &#39;http://www.111cn.net/&#39;);
curl_setopt($ch, CURLOPT_RANGE, &#39;0-500&#39;);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, $writefn);
$result = curl_exec($ch);
curl_close($ch);
?>

一些常见的状态码为:

200 - 服务器成功返回网页

404 - 请求的网页不存在

503 - 服务器超时

301 - 页面重定向