PHPのマルチスレッド処理の問題について

class AsyncOperation extends \Thread {
    public function __construct($arg){
        $this->arg = $arg;
    }
    public function run(){
        if($this->arg){
            printf("Hello %s\n", $this->arg);
        }
    }
}
$thread = new AsyncOperation("World");
if($thread->start())
    $thread->join();
?>

<?php
namespace Home\Controller;
class test extends \Thread {
    public $url;
    public $result;
    
    public function __construct($url) {
        $this->url = $url;
    }
    
    public function run() {
        if ($this->url) {
            $this->result = model_http_curl_get($this->url);
        }
    }
}
function model_http_curl_get($url) {
    $curl = curl_init();  
    curl_setopt($curl, CURLOPT_URL, $url);  
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
    curl_setopt($curl, CURLOPT_TIMEOUT, 5);  
    curl_setopt($curl, CURLOPT_USERAGENT, &#39;Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)&#39;);  
    $result = curl_exec($curl);  
    curl_close($curl);  
    return $result;  
}
for ($i = 0; $i < 10; $i++) {
    $urls[] = &#39;http://www.baidu.com/s?wd=&#39;. rand(10000, 20000);
}
/* 多线程速度测试 */
$t = microtime(true);
foreach ($urls as $key=>$url) {
    $workers[$key] = new test($url);
    $workers[$key]->start();
}
foreach ($workers as $key=>$worker) {
    while($workers[$key]->isRunning()) {
        usleep(100);  
    }
    if ($workers[$key]->join()) {
        dump($workers[$key]->result);
    }
}
$e = microtime(true);
echo "多线程耗时：".($e-$t)."秒<br>";  
/* 单线程速度测试 */
$t = microtime(true);
foreach ($urls as $key=>$url) {
    dump(model_http_curl_get($url));
}
$e = microtime(true);
echo "For循环耗时：".($e-$t)."秒<br>";

<?php
echo date("Y-m-d H:m:s",time());
echo " ";echo floor(microtime()*1000);
echo "<br>";$mtime = explode(" ", microtime());$mtime = $mtime[1].($mtime[0] * 1000);
$mtime2 = explode(".", $mtime);
$mtime = $mtime2[0]; echo $mtime;echo "<br>";
$urls=array(&#39;http://www.a.com&#39;, &#39;http://www.b.com&#39;, &#39;http://www.c.com&#39;, &#39;http://www.d.com&#39;,&#39;http://www.e.com&#39;); 
print_r(async_get_url($urls)); 
//[0]=>example1,[1]=>example2
echo "<br>";
echo date("Y-m-d H:m:s",time());
echo " ";
echo floor(microtime()*1000);
echo "<br>";
$mtime_ = explode(" ", microtime());
$mtime_ = $mtime_[1].($mtime_[0] * 1000);
$mtime2_ = explode(".", $mtime_);$mtime_ = $mtime2_[0]; 
echo $mtime_;
echo "<br>";
echo $mtime_ - $mtime;
function async_get_url($url_array, $wait_usec = 0)
{
if (!is_array($url_array))
return false;
$wait_usec = intval($wait_usec);
$data = array();
$handle = array();
$running = 0;
$mh = curl_multi_init(); 
// multi curl handler$i = 0;
foreach($url_array as $url) 
{
$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 // return don&#39;t printcurl_setopt($ch, CURLOPT_TIMEOUT, 30);
 curl_setopt($ch, CURLOPT_USERAGENT, &#39;Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)&#39;);
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
 // 302 redirectcurl_setopt($ch, CURLOPT_MAXREDIRS, 7);
 curl_multi_add_handle($mh, $ch); 
 // 把 curl resource 放进 multi curl handler 里
 $handle[$i++] = $ch;}
 /* 执行 */
 do 
 {
 curl_multi_exec($mh, $running);
 if ($wait_usec > 0) 
 /* 每个 connect 要间隔多久 */
 usleep($wait_usec);
  // 250000 = 0.25 sec} while ($running > 0);/* 读取资料 */
  foreach($handle as $i => $ch) 
  {$content = curl_multi_getcontent($ch);
  $data[$i] = (curl_errno($ch) == 0) ? $content : false;}
  /* 移除 handle*/
  foreach($handle as $ch) {
  curl_multi_remove_handle($mh, $ch);
  }
  curl_multi_close($mh);
  return $data;}
  ?>