Download PHP Class

download.php

<?php

class download{
	public function startDownload( $vFilePath, $vDownloadName=""){
		$vFilename		= basename( $vFilePath);
		$vNewFilename	= $vDownloadName == "" ? $vFilename : $vDownloadName;
		$vFileType 		= $this->getFileType( $vFilename);
		$vContentType	= $this->GetContentType( $vFileType);

		// Fix IE bug [0]
		$header_file = (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) ? preg_replace('/\./', '%2e', $vNewFilename, substr_count($vNewFilename, '.') - 1) : $vNewFilename;
		
		// Prepare headers
		header("Pragma: public");
		header("Expires: 0");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Cache-Control: public", false);
		header("Content-Description: File Transfer");
		header("Content-Type: " . $vContentType);
		header("Accept-Ranges: bytes");
		header("Content-Disposition: attachment; filename=\"" . $header_file . "\";");
		header("Content-Transfer-Encoding: binary");
		header("Content-Length: " . filesize($vFilePath));

		set_time_limit(0);

		// download mittels readfile funktioniert nicht bei grossen dateien

		/* datei paeckchenweise lesen und in den buffer schreiben */
		$vBlockSize = 1048576;//1024;
		$vDownlSpeed= 10;

		$dlfile= fopen( $vFilePath, 'r');
		while (!feof($dlfile) && connection_status() == 0){
			//reset time limit for big files
			set_time_limit(0);
			print fread( $dlfile, $vBlockSize*$vDownlSpeed);
			flush();
		}
		fclose( $dlfile);
		exit();
	}

	function getFileType( $vFilename){
		return strtolower(substr(strrchr($vFilename,"."),1));
	}

	function GetBrowserId(){
		$browser= $_SERVER['HTTP_USER_AGENT'];

		if(ereg('Opera(/| )([0-9].[0-9]{1,2})', $browser)) {
			return 'OPERA';
		} else if(ereg('MSIE ([0-9].[0-9]{1,2})', $browser)) {
			return 'IE';
		} else if(ereg('OmniWeb/([0-9].[0-9]{1,2})', $browser)) {
			return 'OMNIWEB';
		} else if(ereg('(Konqueror/)(.*)', $browser)) {
			return 'KONQUEROR';
		} else if(ereg('Mozilla/([0-9].[0-9]{1,2})', $browser)) {
			return 'MOZILLA';
		} else {
			return 'OTHER';
		}
	}

	function GetContentType( $FileType=""){
		$vBrowser= $this->GetBrowserId();
		switch ($FileType) {
			case "exe": (($vBrowser=='IE' || $vBrowser=='OPERA') ? ($ctype="application/octetstream") : ($ctype="application/octet-stream")); break;
			case "pdf": $ctype="application/pdf"; break;
			case "zip": $ctype="application/zip"; break;
			case "doc": $ctype="application/msword"; break;
			case "xls": $ctype="application/vnd.ms-excel"; break;
			case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
			case "gif": $ctype="image/gif"; break;
			case "png": $ctype="image/png"; break;
			case "wmv": $ctype="video/x-ms-wmv"; break;
			case "jpe": case "jpeg": case "jpg": $ctype="image/jpg"; break;
			default: $ctype="application/force-download"; break;
		}

		return $ctype;
	}
}

// sample usage

$cDownload= new download();
$cDownload->startDownload( $_SERVER['DOCUMENT_ROOT'] . $page->pdf->url );