PHP Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in C:apache2triadhtdocsimagedisplay.php on line 28

hi i am getting an error during my execution of the code : PHP Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';' in C:\apache2triad\htdocs\imagedisplay.php on line 28

$dir= "C:\apache2triad\htdocs\phppgadmin\images\phpimages";

$file_display= array('jpg', 'jpeg', 'png', 'gif');


if(file_exists($dir)== false) 
{
  echo "directory x not found";
}
else
{
  $dir_content= scandir($dir);

  foreach($dir_content as $file)

  {
    $file_type = strtolower(end(explode('.', $file)));

    // echo "$file 
 ";

    if($file !=='.' && $file !=='..')
    {
      //echo "$file 
 ";   
      echo "";
    }      

  }   
}
?>

please help