Php method for downloading various files based on the header function

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<?php/*** Download File * Header function **/dl_file ($_get [' filename ']), function Dl_file ($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": $ctyp   E = "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 ();}? >

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