public function get($line)
    {
        return isset($this->lines[$line-1]) ? $this->lines[$line-1] : null;
    }
public function get($line)
    {
        return isset($this->lines[$line-1]) ? $this->lines[$line-1] : null;
    }
public function get ( $ line ) { return isset ( $ this -> lines [ $ line - 1 ] ) ? $ this -> lines [ $ line - 1 ] : null ; }
Gets content of the line

@return string return null if content deleted
Gets content of the line