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:
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 ( empty empty ( $urlinfo [ 'path' ])){ $urlinfo [ 'path' ] = '/' ; } $host = $urlinfo [ 'host' ]; $uri = $urlinfo [ 'path' ] . ( empty empty ( $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:
$ch = curl_init(); curl_setopt( $ch , CURLOPT_URL, 'http://HdhCmsTestspiegel.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 $result ; /** *But as noted before if the server doesn't honor this header but sends the whole file curl will download all of it. E.g. http://HdhCmsTest111cn.net ignores the header. But you can (in addition) set a write function callback and abort the request when more data is received, e.g. * php 5.3+ only * use function writefn($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://HdhCmsTest111cn.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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