Detailed analysis of how PHP implements asynchronous execution of scripts

The example in this article describes how to implement asynchronous execution of scripts through PHP programming. Share it with everyone for your reference, the details are as follows:

php language must use the fsockopen() function to implement asynchronous running of the script, the code is as follows

Asynchronous request function (If the debug parameter is true, it is used for debugging. If you enable debugging, you can see the asynchronous execution, but the asynchronous effect will be lost)

main.php

##

<?php
function request_by_fsockopen($url,$post_data=array(),$debug=false){
  $url_array = parse_url($url);
  $hostname = $url_array[&#39;host&#39;];
  $port = isset($url_array[&#39;port&#39;])? $url_array[&#39;port&#39;] : 80;
  @$requestPath = $url_array[&#39;path&#39;] ."?". $url_array[&#39;query&#39;];
  $fp = fsockopen($hostname, $port, $errno, $errstr, 10);
  if (!$fp) {
    echo "$errstr ($errno)";
    return false;
  }
  $method = "GET";
  if(!empty($post_data)){
    $method = "POST";
  }
  $header = "$method $requestPath HTTP/1.1\r\n";
  $header.="Host: $hostname\r\n";
  if(!empty($post_data)){
    $_post = strval(NULL);
    foreach($post_data as $k => $v){
    $_post[]= $k."=".urlencode($v);//必须做url转码以防模拟post提交的数据中有&符而导致post参数键值对紊乱
    }
    $_post = implode(&#39;&&#39;, $_post);
    $header .= "Content-Type: application/x-www-form-urlencoded\r\n";//POST数据
    $header .= "Content-Length: ". strlen($_post) ."\r\n";//POST数据的长度
    $header.="Connection: Close\r\n\r\n";//长连接关闭
    $header .= $_post; //传递POST数据
  }else{
    $header.="Connection: Close\r\n\r\n";//长连接关闭
  }
  fwrite($fp, $header);
  //-----------------调试代码区间-----------------
  //注如果开启下面的注释,异步将不生效可是方便调试
  if($debug){
  $html = &#39;&#39;;
  while (!feof($fp)) {
  $html.=fgets($fp);
  }
  echo $html;
  }
  //-----------------调试代码区间-----------------
  fclose($fp);
}
$data=array(&#39;name&#39;=>&#39;guoyu&#39;,&#39;pwd&#39;=>&#39;123456&#39;);
$url=&#39;http://localhost/test/other.php&#39;;
request_by_fsockopen($url,$data,true);//

other.php

<?php
header("content-type:text/html;charset=utf-8");
//error_reporting(0);
//ini_set(&#39;html_errors&#39;,false);
//ini_set(&#39;display_errors&#39;,false);
$name = isset($_POST[&#39;name&#39;])?$_POST[&#39;name&#39;]:&#39;&#39;;
$pwd = isset($_POST[&#39;pwd&#39;])?$_POST[&#39;pwd&#39;]:&#39;&#39;;
echo $name.$pwd;
echo &#39;success ok&#39;;
die;
?>

Usage example:

[Running main.php main script file]

$data=array('name'=>'guoyu','pwd'=>'123456');
$url='http://localhost/test/other.php';
request_by_fsockopen($url,$data,true);//把应用B的用户表异步-同步数据

[Guide execution file other.php]

In other.php, you can use $_POST to receive the parameters submitted by main.php, so as to proceed to the next step

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