How to implement multi-threading in php?

How to implement multi-threading in PHP: (Recommended learning: PHP programming from entry to proficiency)

Use the shell_exech function in shell mode. Each time you add a thread, it is equivalent to using PHP to open a shell for independent operations.

Add Pthread to your PHP Extension, and then use the API provided by Pthread to operate PHP multi-threading.

start(); 
$ts2 = new pthreadsTest();
$ts2->start(); 
?>

The following is a thread class used to request a certain interface. Next, write two multi-threaded application examples based on it:

class Request extends Thread {
    public $url;
    public $response;
    public function __construct($url) {
        $this->url = $url;
    }
    public function run() {
        $this->response = file_get_contents($this->url);
    }
}

Asynchronous request

Split the synchronous request into multiple threads for asynchronous calls, To improve the operating efficiency of the program.

$chG = new Request("www.google.com");
$chB = new Request("www.baidu.com");
$chG ->start();
$chB ->start();
$chG->join();
$chB->join();

$gl = $chG->response;
$bd = $chB->response;

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