我有一个Youtube视频下载脚本，当我粘贴网址并单击“下载”按钮时，将下载download.php文件而不是下载视频文件。
这是YoutubeDownloader.php文件
<?php
class YoutubeDownloader
{
protected $url;
protected $fullInfo;
public function __construct($url)
{
$this->url = $url;
}
public function getFullInfo()
{
if (is_null($this->fullInfo)) {
preg_match("/^.*((youtu.be\/)|(v\/)|(\/u\/\w\/)|(embed\/)|(watch\?))\??v?=?([^#\&\?]*).*/i", $this->url, $matches);
$videoId = $matches[7];
$clearContent = file_get_contents("https://www.youtube.com/watch?v=$videoId");
preg_match('/ytplayer.config = (\{.+});ytplayer/', $clearContent, $mathes);
$configData = json_decode($mathes[1], true);
$streamList = explode(',', $configData['args'] ['url_encoded_fmt_stream_map']);
$configData['args']['url_encoded_fmt_stream_map'] = array();
foreach ($streamList AS $stream) {
parse_str($stream, $res);
$configData['args']['url_encoded_fmt_stream_map'][] = $res;
}
$streamList = explode(',', $configData['args']['adaptive_fmts']);
$configData['args']['adaptive_fmts'] = array();
foreach ($streamList AS $stream) {
parse_str($stream, $res);
$configData['args']['adaptive_fmts'][] = $res;
}
$this->fullInfo = $configData['args'];
$this->fullInfo['html'] = $clearContent;
$this->fullInfo['video_id'] = $videoId;
$jsPath = $configData['assets']['js'];
$jsPlayerClear = file_get_contents('https://www.youtube.com' . $jsPath);
preg_match('/set\("signature",\s*(?:([^(]*).*)\)/', $jsPlayerClear, $mathes);
$signParserFnName = $mathes[1];
preg_match("/$signParserFnName=(function\(.+;)/", $jsPlayerClear, $mathes);
$signFnBody = $mathes[1];
preg_match("/(\w+)\.\w+\([\w\d,]+\)/", $signFnBody, $mathes);
$helperObjName = $mathes[1];
preg_match_all("/$helperObjName\.(\w+)\(\w+,(\d+)\);/", $signFnBody, $matches);
$startPos = strpos($jsPlayerClear, "$helperObjName={");
$calcRule = array();
foreach ($matches[1] AS $i => $fnName) {
$calcRule[] = array(
'function' => $fnName,
'param' => $matches[2][$i],
);
}
$endPos = $startPos + strlen($helperObjName) + 2;
$startPos += strlen($helperObjName) + 1;
$countOpenBraces = 1;
while ($countOpenBraces > 0) {
$char = substr($jsPlayerClear, $endPos, 1);
$endPos++;
if ($char == '{') {
$countOpenBraces++;
} elseif ($char == '}') {
$countOpenBraces--;
}
}
$helperObjBody = substr($jsPlayerClear, $startPos, $endPos - $startPos);
preg_match_all('/(\w+):function\([\w,]+\){([^}]+)}/', $helperObjBody, $matches);
$calcFunctions = array();
foreach ($matches[1] AS $i => $fnName) {
$fnBody = $matches[2][$i];
if (strpos($fnBody, 'reverse') !== false) {
$calcFunctions[$fnName] = 'reverse';
continue;
}
if (strpos($fnBody, 'splice') !== false) {
$calcFunctions[$fnName] = 'splice';
continue;
}
$calcFunctions[$fnName] = 'swap';
}
foreach ($calcRule AS &$calcItem) {
$calcItem['function'] = $calcFunctions[$calcItem['function']];
}
$this->fullInfo['calcSignatureSteps'] = $calcRule;
$calcSignExpression = <<<JS
function calculateSignature(sign){
var __HELPER_OBJ_NAME = __HELPER_OBJ_BODY__;
var calcSign = __SIGN_FN_BODY__;
return calcSign(sign);
}
JS;
$calcSignExpression = str_replace('__HELPER_OBJ_NAME', $helperObjName, $calcSignExpression);
$calcSignExpression = str_replace('__HELPER_OBJ_BODY__', $helperObjBody, $calcSignExpression);
$calcSignExpression = str_replace('__SIGN_FN_BODY__', $signFnBody, $calcSignExpression);
$this->fullInfo['jsSignatureGen'] = $calcSignExpression;
}
return $this->fullInfo;
}
public function getBaseInfo()
{
$fullInfo = $this->getFullInfo();
$baseInfo = array();
$baseInfo['name'] = $fullInfo['title'];
$videoId = $fullInfo['video_id'];
$baseInfo['previewUrl'] = "https://img.youtube.com/vi/$videoId/hqdefault.jpg";
$html = $fullInfo['html'];
if (preg_match('/<p id="eow-description"[^>]+>(.+)<\/p>/', $html, $matches)) {
$baseInfo['description'] = strip_tags(str_replace('<br />', "\n", $matches[1]));
}
return $baseInfo;
}
public static function getItagInfo()
{
return array(
5 => array('format' => 'flv', 'withVideo' => true, 'withAudio' => true),
6 => array('format' => 'flv', 'withVideo' => true, 'withAudio' => true),
13 => array('format' => '3gp', 'withVideo' => true, 'withAudio' => true),
17 => array('format' => '3gp', 'withVideo' => true, 'withAudio' => true),
18 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
22 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
34 => array('format' => 'flv', 'withVideo' => true, 'withAudio' => true),
35 => array('format' => 'flv', 'withVideo' => true, 'withAudio' => true),
36 => array('format' => '3gp', 'withVideo' => true, 'withAudio' => true),
37 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
38 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
43 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
44 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
45 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
46 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
82 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
83 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
84 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
85 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
100 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
101 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
102 => array('format' => 'webm', 'withVideo' => true, 'withAudio' => true),
92 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
93 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
94 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
95 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
96 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
132 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
151 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => true),
133 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
134 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
135 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
136 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
137 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
138 => array('format' => 'mp4', 'withVideo' => true, 'withAudio' => false),
172 => array('format' => 'webm', 'withVideo' => false, 'withAudio' => true),
);
}
static protected function calcSignature($signatureEncoded, $steps)
{
$sign = str_split($signatureEncoded);
foreach ($steps AS $step) {
$fn = $step['function'];
$param = (int)$step['param'];
switch ($fn) {
case 'reverse':
$sign = array_reverse($sign);
break;
case 'splice':
$sign = array_slice($sign, $param);
break;
case 'swap':
$c = $sign[0];
$sign[0] = $sign[$param % count($sign)];
$sign[$param] = $c;
break;
}
}
return implode('', $sign);
}
public static function getResponseHeaders($url)
{
$clearHeaders = get_headers($url);
$headers = array();
foreach ($clearHeaders AS $header) {
$header = explode(':', $header);
if (count($header) === 2) {
$headers[$header[0]] = trim($header[1]);
}
}
return $headers;
}
public static function getFileSizeHuman($size){
if (!$size) {
return '-';
}
return round($size / 1024 / 1024, 2) . ' MB';
}
public function getDownloadInfoOne($fmtsItem)
{
$fullInfo = $this->getFullInfo();
$title = $fullInfo['title'];
$url = $fmtsItem['url'] . '&title=' . urlencode($title);
$signature = false;
if (isset($fmtsItem['signature'])) {
$signature = $fmtsItem['signature'];
}
if (isset($fmtsItem['sig'])) {
$signature = self::calcSignature($fmtsItem['sig'], $fullInfo['calcSignatureSteps']);
}
if (isset($fmtsItem['s'])) {
$signature = self::calcSignature($fmtsItem['s'], $fullInfo['calcSignatureSteps']);
}
if ($signature) {
$url .= '&signature=' . $signature;
}
$headers = self::getResponseHeaders($url);
$downloadInfo = array();
$downloadInfo['fileSize'] = (int)$headers['Content-Length'];
$downloadInfo['fileSizeHuman'] = self::getFileSizeHuman($downloadInfo['fileSize']);
$downloadInfo['url'] = $url;
$downloadInfo['youtubeItag'] = $fmtsItem['itag'];
$downloadInfo['fileType'] = explode(';', $fmtsItem['type']);
$downloadInfo['fileType'] = $downloadInfo['fileType'][0];
$ext = explode('/', $downloadInfo['fileType']);
$ext = $ext[1];
$downloadInfo['name'] = $title . '.' . $ext;
$downloadInfo['itagInfo'] = self::getItagInfo();
if (isset($downloadInfo['itagInfo'][$fmtsItem['itag']])) {
$downloadInfo['itagInfo'] = $downloadInfo['itagInfo'][$fmtsItem['itag']];
} else {
$downloadInfo['itagInfo'] = null;
}
$downloadInfo[] = $downloadInfo;
return $downloadInfo;
}
/**
* Return array of download information for video
*
* @return VideoDownloadInfo[]
* @throws VideoDownloaderDownloadException
*/
public function getDownloadsInfo()
{
$fullInfo = $this->getFullInfo();
$fmts = $fullInfo['url_encoded_fmt_stream_map'];
$fmts = array_merge($fmts, $fullInfo['adaptive_fmts']);
$downloadsInfo = array();
foreach ($fmts AS $item) {
$downloadsInfo[] = $this->getDownloadInfoOne($item);
}
return $downloadsInfo;
}
public function downloadForItag($itag)
{
$fullInfo = $this->getFullInfo();
$fmts = $fullInfo['url_encoded_fmt_stream_map'];
$fmts = array_merge($fmts, $fullInfo['adaptive_fmts']);
foreach ($fmts AS $item) {
if ($item['itag'] == $itag) {
$dlInfo = $this->getDownloadInfoOne($item);
set_time_limit(0);
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
$qwoteName = str_replace('"', '', $dlInfo['name']);
header('Content-Disposition: attachment; filename="' . $qwoteName . '"');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . $dlInfo['fileSize']);
ob_clean();
flush();
readfile($dlInfo['url']);
die();
}
}
header('Not found', true, 404);
echo "404 Not found";
die();
}
}
这是download.php文件
<?php
set_time_limit(0);
require './YoutubeDownloader.php';
if (!isset($_GET['id'])) {
header('Bad request', true, 400);
echo "id param is required";
die();
}
$id = $_GET['id'];
$yd = new YoutubeDownloader('https://www.youtube.com/watch?v=' . $id);
if (!isset($_GET['itag'])) {
$info = $yd->getFullInfo();
$itag = $info['url_encoded_fmt_stream_map'][0]['itag'];
} else {
$itag = $_GET['itag'];
}
$yd->downloadForItag($itag);
请帮助我修复它，因为它是PHP的新功能，您可以在https //：youtubehap.com上查看它。