Three ways to implement multithreading in PHP

function main(){ 
 
   $sql = "select waybill_id,order_id from waybill where status>40 order by update_time desc limit 10 "; 
 
    $data = Yii::app()->db->createCommand($sql)->queryAll(); //yii 框架格式 
 
    foreach ($data as $k => $v) {  
 
      if ($k % 2 == 0) { //偶数发一个网址 
 
        $send_data[$k]['url'] = ''; 
 
        $send_data[$k]['body'] = $v['waybill_id']; 
 
      } else { //奇数发送另外一个网址 
        $send_data[$k]['url'] = 'http://www.abc.com'; 
 
        $send_data[$k]['body']=array($v['order_id'] => array('extra' => 16)); 
 
      } 
 
    } 

    $back_data =sendMulitRequest($send_data); 
 
    var_dump($back_data); 
 
  } 
  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;  
  }

function sendStream() { 
    $english_format_number = number_format($number, 4, '.', ''); 
 
    echo $english_format_number;  
    exit(); 
    $timeout = 10; 
    $result = array(); 
    $sockets = array(); 
    $convenient_read_block = 8192; 
    $host = "test.local.com"; 
    $sql = "select waybill_id,order_id from xm_waybill where status>40 order by update_time desc limit 1 ";  
    $data = Yii::app()->db->createCommand($sql)->queryAll(); 
    $id = 0; 
 
    foreach ($data as $k => $v) { 
      if ($k % 2 == 0) { 
        $send_data[$k]['body'] = NoticeOrder::getSendData($v['waybill_id']); 
 
      } else { 
        $send_data[$k]['body'] = array($v['order_id'] => array('extra' => 16));  
      }  
      $data = json_encode($send_data[$k]['body']); 
      $s = stream_socket_client($host . ":80", $errno, $errstr, $timeout, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT); 
      if ($s) {  
        $sockets[$id++] = $s; 
        $http_message = "GET /php/test.php?data=" . $data . " HTTP/1.0\r\nHost:" . $host . "\r\n\r\n";  
        fwrite($s, $http_message); 
      } else {  
        echo "Stream " . $id . " failed to open correctly."; 
      }  
    } 
 
    while (count($sockets)) { 
 
      $read = $sockets; 
 
      stream_select($read, $w = null, $e = null, $timeout); 
       if (count($read)) {  
        /* stream_select generally shuffles $read, so we need to 
         compute from which socket(s) we're reading. */ 
        foreach ($read as $r) { 
 
          $id = array_search($r, $sockets); 
          $data = fread($r, $convenient_read_block); 
          if (strlen($data) == 0) { 
            echo "Stream " . $id . " closes at " . date(&#39;h:i:s&#39;) . ".<br>  "; 
            fclose($r); 
             unset($sockets[$id]); 
          } else { 
            $result[$id] = $data; 
          } 
        } 
      } else {  
        /* A time-out means that *all* streams have failed 
         to receive a response. */ 
        echo "Time-out!\n"; 
        break; 
      }  
    }  
    print_r($result); 
 
  }

function daemon($func_name,$args,$number){ 
  while(true){ 
    $pid=pcntl_fork(); 
    if($pid==-1){ 
      echo "fork process fail"; 
      exit(); 
    }elseif($pid){//创建的子进程 
 
      static $num=0; 
      $num++; 
      if($num>=$number){ 
        //当进程数量达到一定数量时候，就对子进程进行回收。 
        pcntl_wait($status); 
 
        $num--; 
      }  
    }else{ //为0 则代表是子进程创建的，则直接进入工作状态 
 
      if(function_exists($func_name)){ 
        while (true) { 
          $ppid=posix_getpid(); 
          var_dump($ppid); 
          call_user_func_array($func_name,$args); 
          sleep(2); 
        } 
      }else{ 
        echo "function is not exists"; 
      } 
      exit();   
    } 
  } 
}  
function worker($args){  
  //do something 
 
}  
daemon('worker',array(1),2);