PHP Download file

<?PHP/** * Download File * Header function **/Dl_file ($_get[' filename ']);functionDl_file ($file){ $file= ".//images//".$file; //First , see if the file exists  if(!Is_file($file )) {   die("<b>404 File not Found!</b>" ); }  //Gather relevent info about file $len=filesize($file ); $filename=basename($file ); $file _extension=Strtolower(substr(STRRCHR($filename, "."), 1 ) ); //This would set the Content-type to the appropriate setting for the file 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":$ctype= "Video/x-msvideo";  Break; //The following is for extensions that shouldn ' t is downloaded//(sensitive stuff, like PHP files)   Case"PHP": Case"HTM": Case"HTML": Case"TXT": die("<b>cannot is used for".)$file _extension. "Files!</b>" );  Break; default:$ctype= "Application/force-download"; } $file _temp=fopen($file, "R" ); //Begin Writing Headers Header("Pragma:public" ); Header("expires:0" ); Header("Cache-control:must-revalidate, post-check=0, pre-check=0" ); Header("Cache-control:public" ); Header("Content-description:file Transfer" ); //Use the switch-generated content-type Header("Content-type:$ctype" ); //Force the download $header= "content-disposition:attachment; Filename= ".$filename. ";"; Header($header ); Header("Content-transfer-encoding:binary" ); Header("Content-length:".)$len ); //@readfile ($file); Echo fread($file _temp,filesize($file ) ); fclose($file _temp ); Exit ();}?>

PHP Download file