How to download image, PDF, Excel in php

How to download image using in php,
How to download PDF using in php,
How to download Excel using in php,
How to download CSV using in php
How to download PSD using in php

For download images, pdf, excel, zip, csv, tiff, bmp, PSD, ico using php then you can use below code.

$inPath = "IMAGE_ROOT_PATH";
$outPath = "IMAGE_NAME";

$fullPath = $inPath.$outPath;
 
 $tmp = explode(".",$outPath);
 $fsize = filesize($fullPath);

 switch ($tmp[count($tmp)-1]) {
 
   case "pdf": $ctype="application/pdf"; break;
   case "exe": $ctype="application/octet-stream"; break;
   case "zip": $ctype="application/zip"; break;
   case "docx":
   case "doc": $ctype="application/msword"; break;
   case "csv":
   case "xls":
   case "xlsx": $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 "tif":
   case "tiff": $ctype="image/tiff"; break;
   case "psd": $ctype="image/psd"; break;
   case "bmp": $ctype="image/bmp"; break;
   case "ico": $ctype="image/vnd.microsoft.icon"; break;
   default: $ctype="application/force-download";
 }
 
 header("Pragma: public"); // required
 header("Expires: 0");
 header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
 header("Cache-Control: private",false); // required for certain browsers
 header("Content-Type: $ctype");
 header("Content-Disposition: attachment; filename=\"".$outPath."\";" );
 header("Content-Transfer-Encoding: binary");
 header("Content-Length: ".$fsize);
 ob_clean();
 flush();
 readfile($fullPath);
 die;