PHP File Download

<?PHPHeader("content-type:text/html; Charset=utf-8 "); functionDownload$file _path){        $file _path=Iconv("Utf-8", "gb2312",$file _path); if(!Is_file($file _path)){             die("<b>file not found!</b>"); }                if(!file_exists($file _path)){             die("<b>file not found!</b>"); }                $dir _name=dirname($file _path); $file _name=basename($file _path); $len=filesize($file _path); $file _extension=Strtolower(substr(STRRCHR($file _name, "."), 1);//file suffix//According to the file suffix Judge Content-type        Switch($file _extension)        {             Case"PDF":$ctype= "Application/pdf";  Break;  Case"EXE":$ctype= "Application/octet-stream";  Break;  Case"Zip":$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":$ctype= "Image/png";  Break;  Case"JPEG": Case"JPG":$ctype= "Image/jpg";  Break;  Case"MP3":$ctype= "Audio/mpeg";  Break;  Case"WAV":$ctype= "Audio/x-wav";  Break;  Case"MPEG": Case"MPG": Case"MPE":$ctype= "Video/mpeg";  Break;  Case"MOV":$ctype= "Video/quicktime";  Break;  Case"Avi":$ctype= "Video/x-msvideo";  Break; //The following is for extensions that shouldn ' t is downloaded//(sensitive stuff, like PHP files)             Case"PHP": Case"HTM": Case"HTML": Case"TXT": die("<b>cannot download".$file _extension. "Files!</b>" );  Break; default:$ctype= "Application/force-download"; }                //Cache Control        Header("Cache-control:public" ); Header("Cache-control:must-revalidate, post-check=0, pre-check=0" ); Header("Pragma:no-cache" ); Header("expires:0" ); Header("Content-description:file Transfer" ); //Set the download file type and file name        Header("Content-type:".)$ctype); Header("Accept-ranges:bytes"); Header("Content-disposition:attachment; Filename= ".$file _name); Header("Content-transfer-encoding:binary" ); Header("Content-length:".)$len ); //read the file and write it to the client        $resource=fopen($file _path, "RB"); $block _size= 1024; $count= 0;  while(!feof($resource) &&$count<$len){            Echo fread($resource,$block _size); $count+=$block _size; }        fclose($resource); }        //=============================begin process==================================        $dir= "d:\\"; if(!Is_dir($dir)){         die("Dir not right!"); }        $dir=RTrim(Str_replace("\\","/",$dir),"/")." /"; //Accept Request Parameters    if(!Empty($_get) &&isset($_get["File"])){        $file=$_get["File"]; }        if(isset($file)){//If there is a request parameter, downloadDownload$dir.$file); }Else{//print out the files under the corresponding folder (no recursion, no folders)        $dir=Iconv("Utf-8", "gb2312",$dir); $files=Array(); if(Is_dir($dir)) {            if($DH=Opendir($dir)) {                 while(($file=Readdir($DH)) !==false) {                    if(Is_file($dir.$file)){                        Array_push($files,$file); }                }                Closedir($DH); }        }                if(Empty($files)){            Echo"<b>no File in Directory$dir</b> "; }Else{            foreach($files  as $one){            $one=Iconv("gb2312", "Utf-8",$one); Echo"<p>$one<a href= ' download.php?file=$one' > Click to download </a></p> '; }        }    }?>

PHP File Download