php 在web端读出pdf 下载

<?php
// 表示调用文本类型为pdf的应用
header(‘Content-type: application/pdf‘);

// 这句可以输出下载页面进行下载
header(‘Content-Disposition: attachment; filename="downloaded.pdf"‘);

// 能够读出pdf
readfile(‘original.pdf‘);
?>

实现各种文件的下载方法：

<?php 

$file="N1.PDF";

downloadFile($file);
function downloadFile( $fullPath ){ 

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

  // Required for some browsers
  if(ini_get(‘zlib.output_compression‘))
    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/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;
      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);
    ob_clean();
    flush();
    readfile( $fullPath ); 

  } else
    die(‘File Not Found‘); 

}

?>