相关疑难解决方法(0)

我是一个PHP新手,并尝试使用以下方法向现有PHP脚本添加进度条:

$ch=curl_init() or die("ERROR|<b>Error:</b> cURL Error");
curl_setopt($ch, CURLOPT_URL, $c);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch, CURLOPT_FILE, $fp);

//####################################################//
// This is required to curl give us some progress
// if this is not set to false the progress function never
// gets called
curl_setopt($ch, CURLOPT_NOPROGRESS, false);

// Set up the callback
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, 'callback');

// Big buffer less progress info/callbacks
// Small buffer more progress info/callbacks
curl_setopt($ch, CURLOPT_BUFFERSIZE, 128);
//####################################################//

curl_exec($ch);
curl_close($ch);
fclose($fp);

回调函数:

    function callback($download_size, $downloaded, $upload_size, $uploaded)
{
    $percent=$downloaded/$download_size;
  // …