<?php




//输出视频流
function outPutStream($videoUrl) {
ini_set('memory_limit', '1024M'); //修改脚本的最大运行内存 
set_time_limit(600); //设置超时限制为 10分钟
if(!$videoUrl){
header('HTTP/1.1 500 Internal Server Error');
echo "Error: Video cannot be played !";
exit();
}

//获取视频大小
$header_array = get_headers($videoUrl, true);
$sizeTemp = $header_array['Content-Length'];
if (is_array($sizeTemp)) {
$size = $sizeTemp[count($sizeTemp) - 1];
} else {
$size = $sizeTemp;
}

//初始参数
$start = 0;
$end = $size - 1;
$length = $size;
$buffer = 1024 * 1024 * 5; // 输出的流大小 5m

//计算 Range
$ranges_arr = array();
if (isset($_SERVER['HTTP_RANGE'])) {

if (!preg_match('/^bytes=\d*-\d*(,\d*-\d*)*$/i', $_SERVER['HTTP_RANGE'])) {
header('HTTP/1.1 416 Requested Range Not Satisfiable');
}
$ranges = explode(',', substr($_SERVER['HTTP_RANGE'], 6));
foreach ($ranges as $range) {
$parts = explode('-', $range);
$ranges_arr[] = array($parts[0], $parts[1]);
}
$ranges = $ranges_arr[0];
$start = (int)$ranges[0];
if ($ranges[1] != '') {
$end = (int)$ranges[1];
}
$length = min($end - $start + 1, $buffer);
$end = $start + $length - 1;
}else{

// php 文件第一次浏览器请求不会携带 RANGE 为了提升加载速度 默认请求 1 个字节的数据
$start=0;
$end=1;
$length=2;
}

//添加 Range 分段请求
$header = array("Range:bytes={$start}-{$end}");
#发起请求
$ch2 = curl_init();
curl_setopt($ch2, CURLOPT_URL, $videoUrl);
curl_setopt($ch2, CURLOPT_TIMEOUT, 60);
curl_setopt($ch2, CURLOPT_HTTPHEADER, $header);
//设置读取的缓存区大小
curl_setopt($ch2, CURLOPT_BUFFERSIZE, $buffer);
// 关闭安全认证
curl_setopt($ch2, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch2, CURLOPT_SSL_VERIFYHOST, false);
//追踪返回302状态码，继续抓取
curl_setopt($ch2, CURLOPT_HEADER, false);
curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch2, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch2, CURLOPT_CONNECTTIMEOUT, 60);
curl_setopt($ch2, CURLOPT_NOBODY, false);
curl_setopt($ch2, CURLOPT_REFERER, $videoUrl);
//模拟来路
curl_setopt($ch2, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36 Edg/85.0.564.44");
$content = curl_exec($ch2);
curl_close($ch2);
#设置响应头
header('HTTP/1.1 206 PARTIAL CONTENT');
header("Accept-Ranges: bytes");
header("Connection: keep-alive");
header("Content-Type: video/mp4");
header("Access-Control-Allow-Origin: *");
//为了兼容 ios UC这类浏览器 这里加个判断 UC的 Content-Range 是 起始值-总大小减一
if($end!=1){
$end=$size-1;
}
header("Content-Range: bytes {$start}-{$end}/{$size}");
//设置流的实际大小
header("Content-Length: ".strlen($content));
//清空缓存区
ob_clean();
//输出视频流
echo $content;
//销毁内存
unset($content);
}

#输出视频流 
outPutStream("你的视频地址");
die();
?>