Php sample code for obtaining webpage request status _ PHP Tutorial

Php sample code for obtaining the webpage request status. When the webpage returns status code, we usually check whether the website status code is 200 or whether the error page is 404 code, in most cases, we can check whether the webpage status code is 200 or whether the error page code is 404, in most cases, you can use the webmaster tool or ff browser to view the status code. very few people think of writing a function to view the status code.

This article briefly describes the php web page request status application example as follows:

Method 1: Use fsockopen
(Curl_getinfo is not recommended !)

The code is as follows:

Function get_http_code ($ url = "localhost", $ port = 80, $ fsock_timeout = 10 ){
Set_time_limit (0 );
Ignore_user_abort (true );

// Record start time
List ($ usec, $ sec) = explode ("", microtime (true ));
$ Timer ['start'] = (float) $ usec + (float) $ sec;

// Verify the URL
If (! Preg_match ("/^ https? : \/\ // I ", $ url )){
$ Url = "http: //". $ url;
}
// Supports HTTPS
If (preg_match ("/^ https: \// I", $ url )){
$ Port = 443;
}

// Parse the URL
$ Urlinfo = parse_url ($ url );
If (empty ($ urlinfo ['path']) {
$ Urlinfo ['path'] = '/';
}
$ Host = $ urlinfo ['host'];
$ Uri = $ urlinfo ['path']. (empty ($ urlinfo ['query'])? '': $ Urlinfo ['query']);

// Open the connection through fsock
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 );
}

// Submit the request
$ Status = socket_get_status ($ fp );
$ Out = "GET {$ uri} HTTP/1.1 \ r \ n ";
$ Out. = "Host: {$ host} \ r \ n ";
$ Out. = "Connection: Close \ 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 is a simple package of the fsockopen function, which is less efficient but has a high capture success rate. Therefore, I usually use it when snoopy is faulty. 5.0.0 adds support for context. with context, it can also send header information, custom user agent, referer, and cookies. 5.1.0 added the offset and maxlen parameters to read only part of the file.

Method 2: Use snoopy. class. php

Snoopy is a php class used to simulate browser functions. it can obtain webpage content and send forms.

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 );

Some common status codes are:
200-the server returns the webpage successfully
404-the requested webpage does not exist
503-server timeout
301-page redirection

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