php支持分块与断点续传文件下载功能代码

$dowmFile = dirname ( __FILE__ ) . '/Nokia - Always Here.mp3'; //要下载的文件，绝对或相对
$dowmName = 'Nokia - Always Here.mp3';
ob_start ();
getlocalfile ( $dowmFile, $dowmName );
flush ();
ob_flush ();
function getlocalfile($fname, $filename = '') {
  $fsize = filesize ( $fname );
  header ( 'Cache-Control: public' );
  header ( 'Pragma: public' );
  header ( 'Accept-Ranges: bytes' );
  header ( 'Connection: close' );
  header ( 'Content-Type: ' . MIMEType ( $fname ) );
  //header('Content-Type: application/octet-stream');
  if (isset ( $filename {0} )) {
    header ( 'Content-Disposition: attachment;filename=' . $filename );
  }
  if ($fp = @fopen ( $fname, 'rb' )) {
    $start = 0;
    $end = $fsize;
    $isRange = isset ( $_SERVER ['HTTP_RANGE'] ) && ($_SERVER ['HTTP_RANGE'] != '');
    if ($isRange) {
      preg_match ( '/^bytes=([0-9]*)-([0-9]*)$/i', $_SERVER ['HTTP_RANGE'], $match );
      $start = $match [1];
      $end = $match [2];
      $isset_start = isset ( $start {0} );
      $isset_end = isset ( $end {0} );
      if ($isset_start && $isset_end) {
        //分块下载
        if ($start >= $fsize || $start < 0 || $start > $end) {
          $start = 0;
          $end = $fsize;
        } else if ($end >= $fsize) {
          $end = $fsize - $start;
        } else {
          $end -= $start - 1;
        }
      } else if ($isset_start && ! $isset_end) {
        //指定位置到结束
        if ($start >= $fsize || $start < 0) {
          $start = 0;
          $end = $fsize;
        } else {
          $end = $fsize - $start;
        }
      } else if (! $isset_start && $isset_end) {
        //最后n个字节
        $end = $end > $fsize ? $fsize : $end;
        $start = $fsize - $end;
      } else {
        $start = 0;
        $end = $fsize;
      }
    }
    if ($isRange) {
      fseek ( $fp, $start );
      header ( 'HTTP/1.1 206 Partial Content' );
      header ( 'Content-Length: ' . $end );
      header ( 'Content-Ranges: bytes ' . $start . '-' . ($end + $start - 1) . '/' . $fsize );
    } else {
      header ( 'Content-Length: ' . $fsize );
    }
    if (function_exists ( 'fpassthru' ) && ($end + $start) == $fsize) {
      fpassthru ( $fp );
    } else {
      echo fread ( $fp, $end );
    }
  } else {
    header ( 'Content-Length: ' . $fsize );
    readfile ( $fname );
  }
  //@header("Content-Type: ".mime_content_type($fname));
}
function MIMEType($fname) {
  $fileSuffix = strtolower ( substr ( $fname, strrpos ( $fname, '.' ) + 1 ) );
  switch ($fileSuffix) {
    case 'avi' :
      return 'video/msvideo';
    case 'wmv' :
      return 'video/x-ms-wmv';
    case 'txt' :
      return 'text/plain';
    case 'htm' :
    case 'html' :
    case 'php' :
      return 'text/html';
    case 'css' :
      return 'text/css';
    case 'js' :
      return 'application/javascript';
    case 'json' :
    case 'xml' :
    case 'zip' :
    case 'pdf' :
    case 'rtf' :
    case 'tar' :
      return 'application/' . $fileSuffix;
    case 'swf' :
      return 'application/x-shockwave-flash';
    case 'flv' :
      return 'video/x-flv';
    case 'jpe' :
    case 'jpg' :
      return 'image/jpeg';
    case 'jpeg' :
    case 'png' :
    case 'gif' :
    case 'bmp' :
    case 'tiff' :
      return 'image/' . $fileSuffix;
    case 'ico' :
      return 'image/vnd.microsoft.icon';
    case 'tif' :
      return 'image/tiff';
    case 'svg' :
    case 'svgz' :
      return 'image/svg+xml';
    case 'rar' :
      return 'application/x-rar-compressed';
    case 'exe' :
    case 'msi' :
      return 'application/x-msdownload';
    case 'cab' :
      return 'application/vnd.ms-cab-compressed';
    case 'aif' :
      return 'audio/aiff';
    case 'mpg' :
    case 'mpe' :
    case 'mp3' :
      return 'audio/mpeg';
    case 'mpeg' :
    case 'wav' :
    case 'aiff' :
      return 'audio/' . $fileSuffix;
    case 'qt' :
    case 'mov' :
      return 'video/quicktime';
    case 'psd' :
      return 'image/vnd.adobe.photoshop';
    case 'ai' :
    case 'eps' :
    case 'ps' :
      return 'application/postscript';
    case 'doc' :
    case 'docx' :
      return 'application/msword';
    case 'xls' :
    case 'xlt' :
    case 'xlm' :
    case 'xld' :
    case 'xla' :
    case 'xlc' :
    case 'xlw' :
    case 'xll' :
      return 'application/vnd.ms-excel';
    case 'ppt' :
    case 'pps' :
      return 'application/vnd.ms-powerpoint';
    case 'odt' :
      return 'application/vnd.oasis.opendocument.text';
    case 'ods' :
      return 'application/vnd.oasis.opendocument.spreadsheet';
    default :
      if (function_exists ( 'mime_content_type' )) {
        $fileSuffix = mime_content_type ( $filename );
      } else {
        $fileSuffix = 'application/octet-stream';
      }
      return $fileSuffix;
      break;
  }
}

define("ROOT_DIR",dirname(__FILE__));
class EcodeFlv {
var $fromFile;   //上传来的文件
var $toFilePath;  //保存文件路径
var $toPicPath;  //保存图片路径
var $mpeg; //ffmpeg程序文件的路径
var $mencode; //mencode程序文件的路径
var $cmdToFile; //转换文件命令
var $cmdToPic;  //转换图片命令
var $toFileName; //转换后的文件名
var $mpegComm; //ffmpeg.exe的转换命令
var $mencodeComm; //mencode.exe的命令
var $mpegType;
var $mencodeType;
var $midi; //mdi.exe的路径
var $cmdMidi; //mdi.exe的命令
//初始化类
function EcodeFlv($fromFile,$toFilePath,$toPicPath,$mpeg,$mencode,$midi) {
$this->mpegComm = false;
$this->mencodeComm = false;
$this->fromFile = $fromFile;
$this->toFilePath = $toFilePath;
$this->toPicPath = ROOT_DIR."/".$toPicPath;
$this->mpeg = ROOT_DIR.$mpeg;
$this->mencode = ROOT_DIR.$mencode;
$this->midi = ROOT_DIR.$midi;
$this->mpegType=array (
"audio/x-mpeg"=>".mp3",
"video/mpeg"=>".mpeg",
"video/3gpp"=>".3gp",
"video/x-ms-asf"=>".asf",
"video/x-msvideo"=>".avi"
);
$this->mencodeType = array(
"application/vnd.rn-realmedia"=>".rm",
"audio/x-pn-realaudio"=>".rmvb",
"audio/x-ms-wmv"=>".wmv",
);
} //检查文件类型

function checkType() {
if(function_exists(mime_content_type)){
return false;
}else{
//$contentType = mime_content_type($this->fromFile);
$exe = "D:serverphpextrasmagic";
$handel = new finfo(FILEINFO_MIME, $exe);
$contentType =  $handel->file($this->fromFile);
}
foreach($this->mpegType as $index=>$key){
if($contentType == $index){
$name = md5(date("Ymd").tiime());
$this->toFileName = $name;
$this->$mpegComm = true;
return true;
}
}
foreach($this->mencodeType as $index=>$key){
if($contentType == $index){
$name = md5(date("Ymd").time());
$this->toFileName = $name;
$this->mencodeComm = true;
return true;
}else{
return false;
}
}
}

//设置文件，图片大小">图片大小
function setSize($flvSize,$picSize) {
$flvWidth = $flvSize[0];
$flvHeight = $flvSize[1];
$picWidth = $picSize[0];
$picHeight = $picSize[1];
$picName = $this->toPicPath.$this->toFileName.".jpg";
$flvName = $this->toFilePath.$this->toFileName.".flv";
$toMdi = ROOT_DIR."/".$flvName;
$size = $picWidth."x".$picHeight;
if($this->mpegComm){
$this->cmdToFile= "$this->mpeg -i $this->fromFile -y -ab 56 -ar 22050 -b 500 -r 15 -s $flvWith*$flvHeight $flvName";
}
elseif($this->mencodeComm){
$this->cmdToFile = "$this->mencode $this->fromFile  -vf scale=$flvWidth:$flvHeight -ffourcc FLV1 -of lavf -ovc lavc -lavcopts vcodec=flv:vbitrate=70:acodec=mp3:abitrate=56:dia=-1 -ofps 25 -srate 22050 -oac mp3lame -o $flvName";
}
$this->cmdToPic = "$this->mpeg -i $toMdi -y -f image2 -ss 8 -t 0.003 -s $size $picName";
$this->cmdMidi = "$this->midi $toMdi /k";
echo $this->cmdToPic;
}

//开始转换
function toEcode() {
set_time_limit(0);
exec($this->cmdToFile,$flvStatus)
exec($this->cmdToPic,$picStatus);
exec($this->cmdMidi,$mStatus);
}

}

<script type="text/javascript">
function getProfile(str) { 
    var arr = str; 
    document.getElementById("firstname").innerHTML = arr.firstname; 
} 
</script>
<body>
<div id="firstname"></div>
</body>
<!-- 使用JSON实现跨域的数据调用，此处如将“profile.php”改为“http://另外一个域名/profile.php”就更能看出跨域了-->
<script type="text/javascript" src="profile.php"></script>

 //定义一个类ClassA，文件名为ClassA.php
class ClassA{
 public  function __construct(){
  echo "ClassA load success!";
 }
}

 //定义一个类ClassB，文件名为ClassB.php，ClassB继承ClassA
class ClassB extends ClassA {
 public function __construct(){
  //parent::__construct();
  echo "ClassB load success!";
 }
}

 function __autoload($classname){
 $classpath="./".$classname.'.php';
 if(file_exists($classpath)){
  require_once($classpath);
 }
 else{
  echo 'class file'.$classpath.'not found!';
 }
}
 
$newobj = new ClassA();
$newobj = new ClassB();