PHP cURL 多句柄更改选项

Question

更改一些选项并删除其他资源我不能使用相同的多句柄：

    $ch1 = curl_init();
    $ch2 = curl_init();
    $ch3 = curl_init();

    curl_setopt($ch1, CURLOPT_URL, "http://mytestsite.com/test.curl.php?test=a");
    curl_setopt($ch1, CURLOPT_HEADER, 0);
    curl_setopt($ch1, CURLOPT_RETURNTRANSFER, TRUE);

    curl_setopt($ch2, CURLOPT_URL, "http://mytestsite.com/test.curl.php?test=b");
    curl_setopt($ch2, CURLOPT_HEADER, 0);
    curl_setopt($ch2, CURLOPT_RETURNTRANSFER, TRUE);

    curl_setopt($ch3, CURLOPT_URL, "http://mytestsite.com/test.curl.php?test=b");
    curl_setopt($ch3, CURLOPT_HEADER, 0);
    curl_setopt($ch3, CURLOPT_RETURNTRANSFER, TRUE);

    $mh = curl_multi_init();

    curl_multi_add_handle($mh,$ch1);
    curl_multi_add_handle($mh,$ch2);
    curl_multi_add_handle($mh,$ch3);

    $active = null;

    do
    {
        $mrc = curl_multi_exec($mh, $active);
    } 
    while ($mrc == CURLM_CALL_MULTI_PERFORM);

    while ($active && $mrc == CURLM_OK) 
    {
        if (curl_multi_select($mh) != -1) 
        {
            do 
            {
                $mrc = curl_multi_exec($mh, $active);
            }
            while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }
    }  

    $test1 = curl_multi_getcontent( $ch1 );
    $test2 = curl_multi_getcontent( $ch2 );
    $test3 = curl_multi_getcontent( $ch3 );
    error_log($test1);  // a
    error_log($test2);  // b
    error_log($test3);  // b

    curl_multi_remove_handle($mh, $ch1);
    // curl_multi_remove_handle($mh, $ch2);
    // curl_multi_remove_handle($mh, $ch3);
    curl_setopt($ch2, CURLOPT_URL, "http://mytestsite.com/test.curl.php?test=c");
    curl_setopt($ch3, CURLOPT_URL, "http://mytestsite.com/test.curl.php?test=c");

    $active = null;

    do
    {
        $mrc = curl_multi_exec($mh, $active);
    } 
    while ($mrc == CURLM_CALL_MULTI_PERFORM);

    while ($active && $mrc == CURLM_OK) 
    {
        if (curl_multi_select($mh) != -1) 
        {
            do 
            {
                $mrc = curl_multi_exec($mh, $active);
            }
            while ($mrc == CURLM_CALL_MULTI_PERFORM);
        }
    }

    $test1 = curl_multi_getcontent( $ch1 );
    $test2 = curl_multi_getcontent( $ch2 );
    $test3 = curl_multi_getcontent( $ch3 );
    error_log($test1);  // a
    error_log($test2);  // b
    error_log($test3);  // b 

    curl_multi_close($mh);

我看到：

a
b
b

a
b
b

我想看到：

a
b
b

a
c
c

根据此常见问题解答

转移后，您只需在句柄中设置新选项并进行另一次转移。如果可以的话，这将使 libcurl 重新使用相同的连接。

可以帮助我吗？

谢谢

Answer 1

您需要正确地从多手柄上卸下通道。中间的正确代码应该看起来像

// [...]
echo curl_multi_getcontent( $ch1 );
echo curl_multi_getcontent( $ch2 );
echo curl_multi_getcontent( $ch3 );

// Removing the channels 
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_remove_handle($mh, $ch3);

// and of course we need to re-add them
curl_setopt($ch2, CURLOPT_URL, "http://example.com/test.curl.php?test=c");
curl_setopt($ch3, CURLOPT_URL, "http://example.com/test.curl.php?test=c");
curl_multi_add_handle($mh,$ch2);
curl_multi_add_handle($mh,$ch3);

$active = null;
// [...]

现在您得到所需的 abbacc 结果。您可能会注意到，我们没有重新添加 $ch1，但仍然得到了结果。这是因为 $ch1 不再处于多重执行中，但仍然是状态为“完成”的有效 cURL 资源，因此仍然具有与之前相同的结果- 一个。您实际上可以在服务器日志中检查这一点，其中根本没有执行对 $ch1 的第二次调用：

[31/Aug/2011:23:42:06 +0200] "GET /test.php?test=a HTTP/1.1" 200 1 "-" "-"
[31/Aug/2011:23:42:06 +0200] "GET /test.php?test=b HTTP/1.1" 200 1 "-" "-"
[31/Aug/2011:23:42:06 +0200] "GET /test.php?test=b HTTP/1.1" 200 1 "-" "-"
[31/Aug/2011:23:42:06 +0200] "GET /test.php?test=c HTTP/1.1" 200 1 "-" "-"
[31/Aug/2011:23:42:06 +0200] "GET /test.php?test=c HTTP/1.1" 200 1 "-" "-"