在句柄关闭之前必须调用 curl_close（） 两次，并且可以读取 cookie jar。这是一个错误吗？

问：

几个小时来，我一直在用头撞墙，试图理解为什么当我尝试阅读 cURL 的 cookie jar 文件时它是空的。但是，我刚刚发现如果我调用两次而不是一次，我的代码就可以工作，我想知道这是否是 cURL 的错误。curl_close()

下面是一个示例：

curl_close($chInfo['handle']);
var_dump(is_resource($chInfo['handle']));

输出 .所以，换句话说，句柄没有关闭，尽管我调用了.boolean truecurl_close()

我的下一个想法是，也许关闭手柄需要一些时间，所以我在通话后尝试使用几秒钟，但没有任何区别。sleep()curl_close()

出于无奈，我试着复制了这一行，像这样：curl_close()

curl_close($chInfo['handle']);
curl_close($chInfo['handle']);
var_dump(is_resource($chInfo['handle']));

输出 ，这意味着句柄已关闭，并且我能够从 cookie jar 文件中读取（当句柄关闭时，cURL 将 cookie 写入文件）。boolean false

那么这是怎么回事呢？这似乎很像一个错误！

编辑：我无法发布我的完整代码（无论如何你都不想阅读它！），但这是一个简化的例子（请注意，在这个例子中只获取了一个 URL，而在我的实际代码中用于同时获取多个 URL）：curl_multi

$curlOptions = array(
    CURLOPT_USERAGENT      => 'Mozilla/5.001 (windows; U; NT4.0; en-US; rv:1.0) Gecko/25250101',
    CURLOPT_CONNECTTIMEOUT => 5, // the number of seconds to wait while trying to connect.
    CURLOPT_TIMEOUT        => 5, // the maximum number of seconds to allow cURL functions to execute.
    CURLOPT_RETURNTRANSFER => 1, // TRUE to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.
    CURLOPT_FOLLOWLOCATION => 1,
    CURLOPT_MAXREDIRS      => 10,
    CURLOPT_AUTOREFERER    => 1,
    CURLOPT_REFERER        => null,
    CURLOPT_POST           => 0,  // GET request by default
    CURLOPT_POSTFIELDS     => '', // no POST data by default
    CURLINFO_HEADER_OUT    => 1, // allows the request header to be retrieved
    CURLOPT_HEADER         => 1, // returns the response header along with the page body
    CURLOPT_URL            => 'http://www.example.com/',
    CURLOPT_COOKIEJAR      => __DIR__ . '/cookie.txt',
    CURLOPT_COOKIEFILE     => __DIR__ . '/cookie.txt'
);

$ch = curl_init();
curl_setopt_array($ch, $curlOptions); // set the options for this handle

$mh = curl_multi_init();
$responses = array();
curl_multi_add_handle($mh, $ch); // add the handle to the curl_multi object

do
{
    $result   = curl_multi_exec($mh, $running);
    $activity = curl_multi_select($mh);    // blocks until there's activity on the curl_multi connection (in which case it returns a number > 0), or until 1 sec has passed

    while($chInfo = curl_multi_info_read($mh))
    {
        $chStatus = curl_getinfo($chInfo['handle']);

        if($chStatus['http_code'] == 200) // if the page was retrieved successfully
        {
            $response = curl_multi_getcontent($chInfo['handle']); // get the response

            curl_multi_remove_handle($mh, $chInfo['handle']); // remove the curl handle that was just completed
            curl_close($chInfo['handle']);                    // close the curl handle that was just completed (cookies are saved when the handle is closed?)
            curl_close($chInfo['handle']);

            var_dump(is_resource($chInfo['handle']));
        }
        else // request failed
        {
            echo 'Error: Request failed with http_code: ' . $chStatus['http_code'] . ', curl error: ' . curl_error($chInfo['handle']). PHP_EOL;
        }
    }
} while ($running > 0);

curl_multi_close($mh);

如果运行上述代码，输出将为

boolean false

表示手柄已关闭。但是，如果删除对 的第二次调用，则输出将更改为curl_close()

boolean true

指示手柄未关闭。