Convert PDF to TEXT with PHP and Linux

To install pdftotext, use: apt-get install xpdf

$file     = $directory.'/'.$filename;
$fileinfo = pathinfo($filename);
$content  = "";

// pdt to text
if($fileinfo['extension'] == 'pdf')
{
   $outpath = preg_replace("/\.pdf$/", "", $file).".txt";
   system("pdftotext -enc UTF-8 ".escapeshellcmd($file), $ret);
   if($ret == 0) {
      $content = file_get_contents($outpath);
      unlink($outpath);
   }
}