function get_line_num(){
		if( ! isset($this->l) ){
			if( isset($this->children[0]) ){
				$this->l = $this->children[0]->get_line_num();
			}
			else {
				$this->l = 0;
			}
		}
		return $this->l;
	}
function get_line_num(){
		if( ! isset($this->l) ){
			if( isset($this->children[0]) ){
				$this->l = $this->children[0]->get_line_num();
			}
			else {
				$this->l = 0;
			}
		}
		return $this->l;
	}
function get_line_num ( ) { if ( ! isset ( $ this -> l ) ) { if ( isset ( $ this -> children [ 0 ] ) ) { $ this -> l = $ this -> children [ 0 ] -> get_line_num ( ) ; } else { $ this -> l = 0 ; } } return $ this -> l ; }
Get line number.
This will search recursively until a terminal node is reached.
@return int
Get line number . This will search recursively until a terminal node is reached .