public function set($key, $value) {
        header('' . $key . ': ' . $value . '', true);
        $this->vars[$key] = $value;
    }
public function set($key, $value) {
        header('' . $key . ': ' . $value . '', true);
        $this->vars[$key] = $value;
    }
public function set ( $ key , $ value ) { header ( '' . $ key . ': ' . $ value . '' , true ) ; $ this -> vars [ $ key ] = $ value ; }
Alias of add
But if key exists, it will be replaced

@param mixed $key
@param mixed $value
Alias of add But if key exists it will be replaced