4 common ways of asynchronous execution in PHP, _PHP tutorial

Four common methods of PHP asynchronous execution,

This article tells you about the php asynchronous calling method and shares it with you. For your reference, the specific content is as follows
The client and server communicate through the HTTP protocol. The client initiates a request, and the server performs processing after receiving the request and returns the processing result.
Sometimes the server needs to perform a time-consuming operation, and the results of this operation do 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: Ajax code or img tag is inserted into the HTML returned by the server. 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&#63;name=fdipzone">

2. Use popen
Use popen to execute commands, 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 speed
Disadvantages:

• 1). Can only be executed on this machine
• 2). You cannot pass a large number of parameters
• 3). When the traffic is high, many processes will be created

3. Use curl
Set curl's timeout CURLOPT_TIMEOUT to 1 (minimum is 1), so the client needs to wait for 1 second

<&#63;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); 
&#63;>

4. Use fsockopen
fsockopen is the best. The disadvantage is that you need to splice the header part yourself.

<&#63;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)&#63; 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); 
} 
   
&#63;>

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

The above is the detailed introduction of php asynchronous calling method . I hope it will be helpful to everyone's learning.

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