


PHP program example for obtaining web page request status_PHP tutorial
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!)
function get_http_code($url="localhost", $port=80, $fsock_timeout=10){
set_time_limit(0);
ignore_user_abort(true);
/ / Recording start time
list($usec, $sec) = explode(" ", microtime(true));
$timer['start'] = (float)$usec + (float)$sec;
// Verify URL
if(!preg_match("/^https?:\/\//i", $url)){
$url = "http://" .$url;
}
// Support HTTPS
if(preg_match("/^https:\/\//i", $url)){
$port = 443;
}
// Parse 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 request
$status = socket_get_status($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);
}
Snoopy is a php class that is used to simulate the functions of a browser. It can obtain web content and send forms.
$ch = curl_init();
curl_setopt($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

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