Some times we have to download a file using php ie force download and
here is the code which helps to download a file

function downloadFile( $fullPath ){ 

  // Must be fresh start 
  if( headers_sent() ) 
    die('Headers Sent'); 

  // Required for some browsers 
    ini_set('zlib.output_compression', 'Off'); 

  // File Exists? 
  if( file_exists($fullPath) ){ 
    // Parse Info / Get Extension 
    $fsize = filesize($fullPath); 
    $path_parts = pathinfo($fullPath); 
    $ext = strtolower($path_parts["extension"]); 
    // Determine Content Type 
    switch ($ext) { 
      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/"; break; 
      case "ppt": $ctype="application/"; break; 
      case "gif": $ctype="image/gif"; break; 
      case "png": $ctype="image/png"; break; 
      case "jpeg": 
      case "jpg": $ctype="image/jpg"; 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: $ctype"); 
    header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" ); 
    header("Content-Transfer-Encoding: binary"); 
    header("Content-Length: ".$fsize); 
    readfile( $fullPath ); 

  } else 
    die('File Not Found'); 


Hope this helps you to download a file using php

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