Auto increment nodes titles

auto-titles.php

// for auto_nodetitle module
<?php
  $count = db_select('node')->fields('node')->condition('type', $node->type)->execute()->rowCount();
  $id = $count+1;
  $title = 'stg'.$id;
  $nodes = db_select('node', 'a')->fields('a', array('title'))->condition('type',$node->type)->execute();
  foreach ($nodes as $nod) {
  	if ($title == $nod->title) {
  		$id = $id + 1;
  		$title = 'stg'.$id;
 
  	}
  }
  print $title;
?>