PHP program example for obtaining web page request status

PHP program example for obtaining web page request status_PHP tutorial

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Release： 2016-07-13 10:24:44

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For the status code returned by the web page, generally we will check whether the status code of our website is 200 or whether the error page is a 404 code, and in most cases our method of checking is to use webmaster tools or ff browser to check. , very few people think of writing a function to view status codes.

This article briefly describes the program example of php to obtain the web page request status as follows:

Method 1, use fsockopen
(curl_getinfo is not recommended!)

Copy code The code is as follows:

file_get_contents is a simple package of the fsockopen function, which is slightly less efficient, but has a high success rate of capture, so I usually use it when snoopy has problems. 5.0.0 adds support for context. With context, it can also send header information, and customize user agents, referers, and cookies. 5.1.0 added offset and maxlen parameters to read only part of the file.

Method 2, use snoopy.class.php

Snoopy is a php class that is used to simulate the functions of a browser. It can obtain web content and send forms.

Copy code The code is as follows:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.jb51.net/');
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; // 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.jb51.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