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PHP breakpoint resume function_PHP tutorial
- WBOYOriginal
- 2016-07-13 17:07:061249browse
Breakpoint resumption refers to artificially dividing the upload task (a file or a compressed package) into several parts during upload, and each part is uploaded using a thread. Let's take a look at PHP breakpoints How to implement the resume function.
Breakpoint resumption refers to artificially dividing the upload task (a file or a compressed package) into several parts during upload, and each part is uploaded using a thread. Let's take a look at PHP breakpoints How to implement the resume function.
/**
* Author Yu Enshui
* Supports resume download
* * Example code:
* * $down = new SD_DownLoad();
* * $down->Down('E:/iso/MS.Office2003SP1.CHS.iso');
**/
class SD_DownLoad {
/**
* Download starting point
*
* @access private
* @var integer
*/
private $mDownStart;
/**
*File size
*
* @access private
* @var integer
*/
private $mFileSize;
/**
* File handle
*
* @access private
* @var integer
*/
private $mFileHandle;
/**
* Full file path
*
* @access private
* @var string
*/
private $mFilePath;
/**
* The file name displayed when downloading the file
*
* @access private
* @var string
*/
private $mFileName;
/**
* Constructor
*
* @access public
* @return void
**/
public function __construct() {
}
/**
* Download
*
* @param string $pFilePath The full path of the file
* @param string pFileName The file name displayed when downloading the file. The default is the actual file name
* @access public
* @return void
**/
public function Down($pFilePath, $pFileName = '') {
$this->mFilePath = $pFilePath;
if(!$this->IniFile()) $this->SendError();
$this->mFileName = empty($pFileName) ? $this->GetFileName() : $pFileName;
$this->IniFile();
$this->SetStart();
$this->SetHeader();
$this->Send();
}
/**
* Initialization file information
*
* @access private
* @return boolean
**/
private function IniFile() {
if(!is_file($this->mFilePath)) return false;
$this->mFileHandle = fopen($this->mFilePath, 'rb');
$this->mFileSize = filesize($this->mFilePath);
return true;
}
/**
*Set download start point
*
* @access private
* @return void
**/
private function SetStart() {
if (!empty($_SERVER['HTTP_RANGE']) && preg_match("/^bytes=([d]?)-([d]?)$/i", $_SERVER['HTTP_RANGE'], $match)) {
if(empty($match[1])) $this->mDownStart = $match[1];
fseek($this->mFileHandle, $this->mDownStart);
}
else {
$this->mDownStart = 0;
}
}
/**
* Set http header
*
* @access private
* @return void
**/
private function SetHeader() {
@header("Cache-control: public");
@header("Pragma: public");
Header("Content-Length: " . ($this->mFileSize - $this->mDownStart));
if ($this->mDownStart > 0) {
@Header("HTTP/1.1 206 Partial Content");
Header("Content-Ranges: bytes" . $this->mDownStart . "-" . ($this->mFileSize - 1) . "/" . $this->mFileSize);
}
else {
Header("Accept-Ranges: bytes");
}
@header("Content-Type: application/octet-stream");
@header("Content-Disposition: attachment;filename=" . $this->mFileName);
}
/**
* Get the file name part of the full path
*
* @access private
* @return string
**/
private function GetFileName() {
return basename ($this->mFilePath);
}
/**
* 发送数据
*
* @access private
* @return void
**/
Private function Send() {
fpassthru($this->mFileHandle);
}
/**
*Sending error
*
* @access public
* @return void
**/
Public function SendError() {
@header("HTTP/1.0 404 Not Found");
@header("Status: 404 Not Found");
exit();
}
}
?>
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