php多线程有几种实现方法

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)); 
 } 
 } 
 }

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."; 
 } 
 } 
 }

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);