code: function &getChild($child, $ignore_text_comments = false) {
  		if (!is_int($child)) {
  			$child = $this->findChild($child);
  		} elseif ($child < 0) {
  			$child += $this->childCount($ignore_text_comments);
  		}
  
  		if ($ignore_text_comments) {
  			$count = 0;
  			$last = null;
  			//foreach($this->children as &$c) {
  			//	if (!$c->isTextOrComment()) {
  			//		if ($count++ === $child) {
  			//			return $c;
  			//		}
  			//		$last = $c;
  			//	}
  			//}
  
  			foreach(array_keys($this->children) as $k) {
  				if (!$this->children[$k]->isTextOrComment()) {
  					if ($count++ === $child) {
  						return $this->children[$k];
  					}
  					$last = $this->children[$k];
  				}
  			}
  			return (($child > $count) ? $last : null);
  		} else {
  			return $this->children[$child];
  		}
  	}
docs: Get childnode
  @param int|DomNode $child Index, negative to count from end
  @param bool $ignore_text_comments Ignore text/comments with index calculation
  @return DomNode