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  • curl_multi_add_handle()

    (PHP 5, PHP 7)

    向curl批处理会话中添加单独的curl句柄

    说明

    curl_multi_add_handle(resource $mh,resource $ch): int

    增加$ch句柄到批处理会话$mh

    参数

    $mh

    由curl_multi_init()返回的 cURL 多个句柄。

    $ch

    由curl_init()返回的 cURL 句柄。

    返回值

    成功时返回0,失败时返回CURLM_XXX之一的错误码。

    范例

    curl_multi_add_handle() example

    这个范例将会创建2个cURL句柄,把它们加到批处理句柄,然后并行地运行它们。

    <?php
    // 创建一对cURL资源
    $ch1 = curl_init();
    $ch2 = curl_init();
    // 设置URL和相应的选项
    curl_setopt($ch1, CURLOPT_URL, "http://www.example.com/");
    curl_setopt($ch1, CURLOPT_HEADER, 0);
    curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
    curl_setopt($ch2, CURLOPT_HEADER, 0);
    // 创建批处理cURL句柄
    $mh = curl_multi_init();
    // 增加2个句柄
    curl_multi_add_handle($mh,$ch1);
    curl_multi_add_handle($mh,$ch2);
    $running=null;
    // 执行批处理句柄
    do {
        curl_multi_exec($mh,$running);
    } while($running > 0);
    // 关闭全部句柄
    curl_multi_remove_handle($mh, $ch1);
    curl_multi_remove_handle($mh, $ch2);
    curl_multi_close($mh);
    ?>
    

    参见

    The 'do' loop in this example will cycle indefinitely until all curl downloads complete, needlessly using CPU cycles. A much better way is to block while dowloads are in progress. Refer to the example code on the curl_multi_exec() page instead, which does this!
    Sometime with arrays and loops (i.e. for or do while or foreach) curl_multi_init loses some hits, to work around this problem it is necessary to divide the loop into two parts: the start with key number zero and than, all the rest. In this way the curl_multi_init doesn't lose any hits. I did a lot of test and it seems to work well enough. 
    <?php
    function set_option($x, $y){
    curl_setopt($x, CURLOPT_URL, $y);
    curl_setopt($x, CURLOPT_HEADER, 0);
    curl_setopt($x, CURLOPT_FOLLOWLOCATION, TRUE);
    curl_setopt($x, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($x, CURLOPT_ENCODING, "gzip,deflate");
    }
    $nodes = array('http://php.net/manual/it/function.curl-multi-add-handle.php', 
    'http://php.net/manual/en/function.curl-multi-init.php', 
    'http://php.net/manual/en/function.curl-multi-setopt.php'
    );
    $node_count = count($nodes);
    $curl_arr = array();
    $master = curl_multi_init();
    /*
    now I put the first part of the array with the start key number zero, add all   
    options and add the curl_multi_add_handle;                        
    it is necessary to detach this first part to avoid to lose some handles and than running 
     the loop with the start key number one.                         
    In this way the curl_multi_init doesn't lose anything and seems to be very stable.    
    */  
      $curl_arr[0] = curl_init($nodes[0]);
      set_option($curl_arr[0], $nodes[0]);
      curl_multi_add_handle($master, $curl_arr[0]);
      
    /* 
    now the loop can start with key number one               
    */
    $i = 1;
    do {
      if ($i!==0){
     
      $curl_arr[$i] = curl_init($nodes[$i]);
      set_option($curl_arr[$i], $nodes[$i]);
      curl_multi_add_handle($master, $curl_arr[$i]);
      }
    $i++;  
    }while($i < $node_count);
    $running = NULL;
    do {
      curl_multi_exec($master,$running);
    } while($running);
    $results = array();
    $q = 0;
    do{
     $results[$q] = curl_multi_getcontent($curl_arr[$q]);
     curl_multi_remove_handle($master, $curl_arr[$q]);
    $q++;  
    }while($q < $node_count);
    foreach($results as $value){
     echo $value;
    }
    ?>
    
    $nodes = array('http://www.google.com', 'http://www.microsoft.com', 'http://yahoo.com');
    $node_count = count($nodes);
    $curl_arr = array();
    $master = curl_multi_init();
    for($i = 0; $i < $node_count; $i++)
    {
      $url =$nodes[$i];
      $curl_arr[$i] = curl_init($url);
      curl_setopt($curl_arr[$i], CURLOPT_RETURNTRANSFER, true);
      curl_multi_add_handle($master, $curl_arr[$i]);
    }
    do {
      curl_multi_exec($master,$running);
    } while($running > 0);
    echo "results: ";
    for($i = 0; $i < $node_count; $i++)
    {
      $results = curl_multi_getcontent ( $curl_arr[$i] );
      echo( $i . "\n" . $results . "\n");
    }
    echo 'done';

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    下篇:curl_multi_close()