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<html>
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<head>
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<title>show curl download progress</title>
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<style type="text/css">
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#progress-bar {
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width: 200px;
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padding: 2px;
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border: 2px solid #aaa;
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background: #666666;
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}
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#progress {
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background: #fff;
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color: #fff000;
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white-space: nowrap;
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padding: 5px 0;
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text-indent: 5px;
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width: 0;
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}
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</style>
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<script type="text/javascript">
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function updateProgress(percentage) {
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var progressElement = document.getElementById_x('progress')
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progressElement.style.width = Math.round(percentage*200)+"px";
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progressElement.innerHTML = Math.round(percentage*100) + '%';
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}
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</script>
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</head>
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<body>
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<div id="progress-bar">
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<div id="progress">0%</div>
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</div>
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<?php
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//需要下载的远程文件url
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$url="没那么简单.mp3?xcode=31a91a4398f5608cf126db69f9daa1ec&mid=0.44357582289098";
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$ch=curl_init();//Initialize a cURL session.
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$fp = fopen("/var/www/target.mp3",'w');
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$a_opt=array(
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CURLOPT_URL => $url,
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CURLOPT_HEADER => 0,//不包含头信息到输出文件target.mp3
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CURLOPT_RETURNTRANSFER => 1,//当CURLOPT_RETURNTRANSFER设置为false时，方法curl_exec的调用在成功时会直接输出结果并返回bool（true），而不是以字符串形式返回取得的结果数据.
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CURLOPT_NOPROGRESS => 0,//true用来禁用curl transfers的进度条显示，注意：php默认设置该选项为true，此处我们需要false
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CURLOPT_PROGRESSFUNCTION => 'progress',//用来显示进度的回调函数
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CURLOPT_FILE => $fp, //目标文件保存路径
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CURLOPT_FOLLOWLOCATION => TRUE,
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CURLOPT_BUFFERSIZE => 64000,
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);
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curl_setopt_array($ch,$a_opt);
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//echo "dltotal, dlnow, percent, now, ultotal, ulnow"."
";
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$str=curl_exec($ch);
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curl_close($ch);
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//$dltotal:download total 下载文件总大小
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//$dlnow:download now 当前已经下载大小
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//$ultotal:upload total 上传文件总大小
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//$ulnow:upload now 当前已经上传大小
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function progress($dltotal,$dlnow,$ultotal, $ulnow){
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$now = date('Y-m-d H:i:s');//当前时间
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//刚开始下载或上传时，$dltotal和$ultotal为0，此处避免除0错误
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if(empty($dltotal)){
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$percent = "0";
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}else{
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$percent = $dlnow/$dltotal;
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}
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//echo "$dltotal, $dlnow, $percent, $now , $ultotal, $ulnow"."
";
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echo "";
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ob_flush();
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flush();
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return(0);
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}
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?>
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</body>
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</html>
调试方法：将$url改为真正可用url（比如打开百度mp3播放器，复制下载地址），新建以上php文件保存到apache根目录下，从浏览器访问即可
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