限制传出 PHP+curl 请求的速率

Question

有没有办法限制（有延迟）向外部服务器发出 PHP+curl 请求的速率，以便每秒只有 n 个请求？PHP 在 Fastcgi 模式下使用，因此无法使用睡眠。

Answer 1

是的。有curl 多重处理程序...

（您可以使用此库以 OOP 方式完成）

例如：

    // Creates the curl multi handle
    $mh = curl_multi_init();
    $handles = array();

    foreach($urls as $url)
    {
        // Create a new single curl handle
        $ch = curl_init();

        // Set options
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 300);

        // Add to the multi handle
        curl_multi_add_handle($mh,$ch);

        // Put the handles in an array to loop this later on
        $handles[] = $ch;
    }

    // Execute the multi handle
    $running=null;

    do
    {
        $mrc = curl_multi_exec($mh,$running);

        // Added a usleep for 0.50 seconds to reduce load
        usleep (250000);
    }
    while($running > 0);

    // Get the content of the urls (if there is any)
    $output = array();
    for($i=0; $i<count($handles); $i++)
    {
        // Get the content of the handle
        $content = curl_multi_getcontent($handles[$i]);
        $output[] = $content;

        if($printOutput) {
            echo $content;
        }

        // Remove the handle from the multi handle
        curl_multi_remove_handle($mh,$handles[$i]);
    }

    // close the multi curl handle to free system resources
    curl_multi_close($mh);