CODE EXAMPLE FOR PHP

shortcode wordpress form

public function add_shortcode_fileds() {
    add_shortcode( 'add_fields', 'input_fields' );
    function input_fields( $atts ) {
        $atts='<form method="post" action="">';
        $atts.='<input type="text">';
        $atts.='<input type="submit">';
        $atts.='</form';
        return $atts;
    }
}