PHP implements multi-threaded code

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PHP itself does not support multi-threading For threads, we can handle multi-threading virtually through PHP's own functions. Three functions are introduced below to implement multi-processing.

1. fsockopen, open a network connection or a Unix socket connection. Among them, stream_set_blocking() - sets blocking or blocking mode for resource flow

* @title:   PHP多线程类(Thread)
 * @version:  1.0
 * 
 * PHP多线程应用示例：
 * require_once 'thread.class.php';
 * $thread = new thread();
 * $thread->addthread('action_log','a');
 * $thread->addthread('action_log','b');
 * $thread->addthread('action_log','c');
 * $thread->runthread();
 * 
 * function action_log($info) {
 *   $log = 'log/' . microtime() . '.log';
 *   $txt = $info . "rnrn" . 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn";
 *   $fp = fopen($log, 'w');
 *   fwrite($fp, $txt);
 *   fclose($fp);
 * }
 */
class thread {
  
  var $hooks = array();
  var $args = array();
  
  function thread() {
  }
  
  function addthread($func)
  {
    $args = array_slice(func_get_args(), 1);
    $this->hooks[] = $func;
    $this->args[] = $args;
    return true;
  }
  
  function runthread()
  {
    if(isset($_GET['flag']))
    {
      $flag = intval($_GET['flag']);
    }
    if($flag || $flag === 0)
    {
      call_user_func_array($this->hooks[$flag], $this->args[$flag]);
    }
    else
    {
      for($i = 0, $size = count($this->hooks); $i < $size; $i++)
      {
        $fp=fsockopen($_SERVER[&#39;HTTP_HOST&#39;],$_SERVER[&#39;SERVER_PORT&#39;]);
        stream_set_blocking($fp,0);
        if($fp)
        {
          $out = "GET {$_SERVER[&#39;PHP_SELF&#39;]}?flag=$i HTTP/1.1rn";
          $out .= "Host: {$_SERVER[&#39;HTTP_HOST&#39;]}rn";
          $out .= "Connection: Closernrn";
          fputs($fp,$out);
          fclose($fp);
        }
      }
    }
  }
}

## 2. stream_socket_client, the new stream_socket_client can be used in PHP5 () function directly replaces fsocketopen(). Among them, stream_set_blocking() - sets blocking or blocking mode for resource flow

<?php
$fp = stream_socket_client("tcp://www.example.com:80", $errno, $errstr, 30);
stream_set_blocking($fp,0);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
    while (!feof($fp)) {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}
?>

3. curl_multi, when multiple threads are needed, curl_multi can be used once It requires multiple operations to complete, but curl uses network communication, so the efficiency and reliability are relatively poor.

function sendMulitRequest($send_data){ 
    $params = array(); 
    $curl = $text = array(); 
    $handle = curl_multi_init(); 
  
    foreach ($data as $k => $v) { 
  
      if (empty($v['url'])) { 
  
        $v['url'] = "http://www.xxx.com"; //if url is empty,set defalut url 
  
      } 
  
      $reqBody = json_encode($v['body']); 
  
      $reqStream = array( 
  
        'body' => $reqBody, 
      );  
      $encRequest = base64_encode(json_encode($reqStream));  
      $params['data'] = $encRequest; 
      $curl[$k] = curl_init(); 
      curl_setopt($curl[$k], CURLOPT_URL, $v['url']); 
      curl_setopt($curl[$k], CURLOPT_POST, TRUE); 
      curl_setopt($curl[$k], CURLOPT_HEADER, 0); 
      curl_setopt($curl[$k], CURLOPT_POSTFIELDS, http_build_query($params)); 
      curl_setopt($curl[$k], CURLOPT_RETURNTRANSFER, 1); 
      curl_multi_add_handle($handle, $curl[$k]); 
    } 
    $active = null; 
  
    do { 
  
      $mrc = curl_multi_exec($handle, $active); 
  
    } while ($mrc == CURLM_CALL_MULTI_PERFORM); 
    while ($active && $mrc == CURLM_OK) { 
  
      if (curl_multi_select($handle) != -1) { 
  
        do { 
  
          $mrc = curl_multi_exec($handle, $active); 
  
        } while ($mrc == CURLM_CALL_MULTI_PERFORM); 
  
      } 
  
    } 
    foreach ($curl as $k => $v) {  
      if (curl_error($curl[$k]) == "") { 
        $text[$k] = (string) curl_multi_getcontent($curl[$k]); 
       }  
      curl_multi_remove_handle($handle, $curl[$k]);  
      curl_close($curl[$k]); 
    } 
    curl_multi_close($handle);  
    return $text;  
  }

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