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, $fsock_timeout=10){
- set_time_limit(0);
- ignore_user_abort(true);
-
-
- list($usec, $sec) = explode(" ", microtime(true));
- $timer['start'] = (float)$usec + (float)$sec;
-
-
- if(!preg_match("/^https?:\/\//i", $url)){
- $url = "http://".$url;
- }
-
- if(preg_match("/^https:\/\//i", $url)){
- $port = 443;
- }
-
-
- $urlinfo = parse_url($url);
- if(emptyempty($urlinfo['path'])){
- $urlinfo['path'] = '/';
- }
- $host = $urlinfo['host'];
- $uri = $urlinfo['path'] . (emptyempty($urlinfo['query'])?'':$urlinfo['query']);
-
-
- if(!$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);
- }
-
-
- $status = socket_get_status($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://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;
-
-
-
-
-
- $writefn = function($ch, $chunk) {
- static $data='';
- static $limit = 500;
- $len = strlen($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 |