PHP多線程批量采集下載圖片的實現代碼

 
/** 
     * curl 多線程 
     * @param array $array 并行網址 
     * @param int $timeout 超時時間
     * @return mix 
     */
 public function Curl_http($array,$timeout='15'){
      $res = array();

      $mh = curl_multi_init();//創建多個curl語柄

      foreach($array as $k=>$url){
          $conn[$k]=curl_init($url);//初始化

          curl_setopt($conn[$k], CURLOPT_TIMEOUT, $timeout);//設置超時時間
          curl_setopt($conn[$k], CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
          curl_setopt($conn[$k], CURLOPT_MAXREDIRS, 7);//HTTp定向級別 ，7最高
          curl_setopt($conn[$k], CURLOPT_HEADER, false);//這里不要header，加塊效率
          curl_setopt($conn[$k], CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
          curl_setopt($conn[$k], CURLOPT_RETURNTRANSFER,1);//要求結果為字符串且輸出到屏幕上          
    curl_setopt($conn[$k], CURLOPT_HTTPGET, true);

          curl_multi_add_handle ($mh,$conn[$k]);
      }
       //防止死循環耗死cpu 這段是根據網上的寫法
          do {
              $mrc = curl_multi_exec($mh,$active);//當無數據，active=true
          } while ($mrc == CURLM_CALL_MULTI_PERFORM);//當正在接受數據時
          while ($active and $mrc == CURLM_OK) {//當無數據時或請求暫停時，active=true
              if (curl_multi_select($mh) != -1) {
                  do {
                      $mrc = curl_multi_exec($mh, $active);
                  } while ($mrc == CURLM_CALL_MULTI_PERFORM);
              }
          }

      foreach ($array as $k => $url) {
            if(!curl_errno($conn[$k])){
             $data[$k]=curl_multi_getcontent($conn[$k]);//數據轉換為array
             $header[$k]=curl_getinfo($conn[$k]);//返回http頭信息
             curl_close($conn[$k]);//關閉語柄
             curl_multi_remove_handle($mh  , $conn[$k]);   //釋放資源 
            }else{
             unset($k,$url);
            }
          }

          curl_multi_close($mh);

          return $data;

   }

//參數接收
$callback = $_GET['callback'];
$hrefs = $_GET['hrefs'];
$urlarray = explode(',',trim($hrefs,','));
$date = date('Ymd',time());
//實例化
$img = new HttpImg();
$stime = $img->getMicrotime();//開始時間

$data = $img->Curl_http($urlarray,'20');//列表數據
mkdir('./img/'.$date,0777);
foreach ((array)$data as $k=>$v){
 preg_match_all("/(href|src)=(["|']?)([^ "'>]+.(jpg|png|PNG|JPG|gif))\\2/i", $v, $matches[$k]);

 if(count($matches[$k][3])>0){
  $dataimg = $img->Curl_http($matches[$k][3],'20');//全部圖片數據二進制
  $j = 0;
  foreach ((array)$dataimg as $kk=>$vv){
   if($vv !=''){
    $rand = rand(1000,9999);
    $basename = time()."_".$rand.".".jpg;//保存為jpg格式的文件
    $fname = './img/'.$date."/"."$basename";
    file_put_contents($fname, $vv);   
    $j++;
    echo "創建第".$j."張圖片"."$fname"."<br/>";
   }else{
    unset($kk,$vv);
   }
  }
 }else{
  unset($matches);
 }
}
$etime = $img->getMicrotime();//結束時間
echo "用時".($etime-$stime)."秒";
exit;