Get taxonomy term depth in Drupal 7

Source code viewer
$tid = 1; // your term id(tid)
$limit = 99;
$depth = 1;
while($parent = db_query('SELECT parent FROM taxonomy_term_hierarchy WHERE tid = '.$tid)->fetchField())
{
  $depth++;
  $tid = $parent;
  if($depth > $limit) break;
}
Programming Language: PHP