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)); $timer['start'] = (float)$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['path'])) { $urlinfo['path'] = '/'; } $host = $urlinfo['host']; $uri = $urlinfo['path'] . (emptyempty($urlinfo['query']) ? '' : $urlinfo['query']); // 通过fsock打开连接 if (!$fp = fsockopen($host, $port, $errno, $error, $fsock_timeout)) { list($usec, $sec) = explode(" ", microtime(true)); $timer['end'] = (float)$usec + (float)$sec; $usetime = (float)$timer['end'] - (float)$timer['start']; return array( 'code' => - 1, 'usetime' => $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)); $timer['end'] = (float)$usec + (float)$sec; $usetime = (float)$timer['end'] - (float)$timer['start']; return array( 'code' => - 2, 'usetime' => $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)); $timer['end'] = (float)$usec + (float)$sec; $usetime = (float)$timer['end'] - (float)$timer['start']; return array( 'code' => $code, 'usetime' => $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, 'http://www.spiegel.de/'); curl_setopt($ch, CURLOPT_RANGE, '0-500'); curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $result = curl_exec($ch); curl_close($ch); echo $result; /** *But as noted before if the server doesn't honor this header but sends the whole file curl will download all of it. E.g. http://www.111cn.net ignores the header. But you can (in addition) set a write function callback and abort the request when more data is received, e.g. * php 5.3+ only * use function writefn($ch, $chunk) { ... } for earlier versions */ $writefn = function ($ch, $chunk) { static $data = ''; static $limit = 500; // 500 bytes, it's only a test $len = strlen($data) + strlen($chunk); if ($len >= $limit) { $data.= substr($chunk, 0, $limit - strlen($data)); echo strlen($data) , ' ', $data; return -1; } $data.= $chunk; return strlen($chunk); }; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, 'http://www.111cn.net/'); curl_setopt($ch, CURLOPT_RANGE, '0-500'); curl_setopt($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

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