How to call method asynchronously using php
php Asynchronous calling method
The client and server communicate through the HTTP protocol. The client initiates a request and the server receives it. Execute processing after request and return processing results.
Sometimes the server needs to perform a time-consuming operation, and the result of this operation does not need to be returned to the client. But because PHP is executed synchronously, the client needs to wait for the service to be processed before proceeding to the next step.
Therefore, time-consuming operations are suitable for asynchronous execution. After the server receives the request, it returns after processing the data required by the client, and then performs time-consuming operations asynchronously on the server. .
1. Use Ajax and img tag
Principle, the server returns Insert Ajax code or img tag into the html, and the src of img is the program that needs to be executed.
Advantages: Simple implementation, the server does not need to perform any calls
Disadvantages: During execution, the browser will always be in the loading state, so This method is not a true asynchronous call.
$.get("doRequest.php", { name: "fdipzone"} );<img src="doRequest.php?name=fdipzone">
2. Use popen
Use popen to execute the command, syntax:
// popen — 打开进程文件指针 resource popen ( string $command , string $mode )
pclose(popen('php /home/fdipzone/doRequest.php &', 'r'));
Advantages: Fast execution
Disadvantages: 1. Can only be executed on this machine
2. You cannot pass a large number of parameters
3. Many processes will be created when the number of visits is high.
3. Use curl
Set the curl timeoutCURLOPT_TIMEOUT is 1 (minimum is 1), so the client needs to wait for 1 second
<?php
$ch = curl_init();
$curl_opt = array(
CURLOPT_URL, 'http://www.example.com/doRequest.php'
CURLOPT_RETURNTRANSFER,1,
CURLOPT_TIMEOUT,1
);
curl_setopt_array($ch, $curl_opt);
curl_exec($ch);
curl_close($ch);
?>##4. Use fsockopen
#fsockopen is the best. The disadvantage is that you need to splice the header part yourself.
<?php
$url = 'http://www.example.com/doRequest.php';
$param = array(
'name'=>'fdipzone',
'gender'=>'male',
'age'=>30
);
doRequest($url, $param);
function doRequest($url, $param=array()){
$urlinfo = parse_url($url);
$host = $urlinfo['host'];
$path = $urlinfo['path'];
$query = isset($param)? http_build_query($param) : '';
$port = 80;
$errno = 0;
$errstr = '';
$timeout = 10;
$fp = fsockopen($host, $port, $errno, $errstr, $timeout);
$out = "POST ".$path." HTTP/1.1\r\n";
$out .= "host:".$host."\r\n";
$out .= "content-length:".strlen($query)."\r\n";
$out .= "content-type:application/x-www-form-urlencoded\r\n";
$out .= "connection:close\r\n\r\n";
$out .= $query;
fputs($fp, $out);
fclose($fp);
}
?>Note: During the execution process, the client connection is disconnected or the connection times out, which may cause incomplete execution, so you need to add
ignore_user_abort(true); // 忽略客户端断开 set_time_limit(0); // 设置执行不超时
Tips: For the introduction and usage of fsockopen, please refer to the "php" I wrote before Use fsockopen GET/POST to submit forms and upload files" and "PHP HTTP request class, support GET, POST, Multipart/form-data"
This article explains how to use PHP asynchronous calling method, more For more related content, please pay attention to php Chinese website. Related recommendations:About comparison between php string compression methods
About php Timer page running time monitoring Relevant introduction to classes
#Introduction to the methods of php constructor supporting different numbers of parameters
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