title: Read only pdf files and get the filename of that pdf files in a directory
body: <p>I need to read only pdf files in a directory and then read the filename of every files then I will use the filename to rename some txt files. I have tried using only eregi function. but it seems cannot read all I need. how to read them well?
  here's my code :</p>
  
  <pre><code>$savePath   ='D:/dir/';
  $dir       = opendir($savePath);
  $filename  = array();
  
  while ($filename = readdir($dir)) {
  if (eregi("\.pdf",$filename)){
      $read = strtok ($filename,"."); //get the filenames
  
  //to rename some txt files using the filenames that I get before
  //$testfile is text files that I've read before
      $testfile = "$read.txt";
      $file = fopen($testfile,"r") or die ('cannot open file');
  
      if (filesize($testfile)==0){} 
      else{
          $text = fread($file,55024);
          fclose($file);
          echo "&lt;/br&gt;"; echo "&lt;/br&gt;";         
      }
  }
  </code></pre>