<?php
class html {
	private $html;
	
	public function __construct($h="") {
		$this->html = $h;
	}
	public function toon() {
		return $this->html;
	}
	public function tag($name,$arg1="",$arg2="",$arg3="") {
		switch($name) {
			case 'meta':
				$this->html .= "<meta name='viewport' content='width=device-width,initial-scale=1,maximum-scale=1'>\n";
				break;
			case 'link':
				$this->html .= "<link rel='$arg1' type='$arg2' href='$arg3'>\n";
				break;
			case 'script':
				$this->html .= "<script src='$arg1'></script>\n";
				break;
			default:
				if ($arg1 == "start") $this->html .= "<$name>\n"; 
				if ($arg1 == "end") $this->html .= "</$name>\n";
				if (empty($arg1)) $this->html .= "<$name>\n"; 
				break;
		}
	}
	public function form_start($css="",$action="",$method="POST") {
		$this->html .= "<form class='".$css."' action='".$action."' method='".$method."'>\n";
	}
	public function form_end() {
		$this->html .= "</form>\n";
	}
	public function br() {
		$this->html .= "<br />\n";
	}
	public function h_start($nr,$css="") {
		$this->html .= "<h".$nr." class='".$css."'>\n";
	}
	public function h_end($nr) {
		$this->html .= "</h".$nr.">\n";
	}
	public function anchor($href,$css="",$caption="link",$par="") {
		if ($par === "p") {
			$this->html .= "<p><a href='".$href."' class='".$css."'>".$caption."</a><p>\n";
		} else {
			$this->html .= "<a href='".$href."' class='".$css."'>".$caption."</a>\n";
		}
	}
	public function label($css="",$caption="label") {
		$this->html .= "<label class='".$css."'><b>".$caption."</b></label>\n";
	}
	public function input($css="",$type,$name,$value="",$required="",$placeholder="") {
		$this->html .= "<input class='".$css."' type='".$type."' name='".$name."' value='".$value."' placeholder='".$placeholder."' ".$required." style='width:98%;'/>\n";
	}
 	public function div_start($css="",$style="",$id="") {
		$this->html .= "<div class='".$css."' style='".$style."' id='$id'>\n";
	}
	public function div_end() {
		$this->html .= "</div>\n";
	}
	public function div($css="",$caption="",$style="") {
		$this->html .= "<div class='".$css."' style='".$style."'>".$caption."</div>\n";
	}
	public function button($css="",$type,$caption="button",$click="") {
		$this->html .= "<button class='".$css."' type='".$type."' onclick='$click'>".$caption."</button>\n";
	}
	public function select_start($css="",$name) {
		$this->html .= "<p><select class='".$css."' name='".$name."'>\n";
	}
	public function select_end() {
		$this->html .= "</select></p>\n";
	}
	public function option($css="",$value,$caption,$selected="",$disabled="") {
		$this->html .= "<option class='".$css."' value='".$value."' ".$disabled." ".$selected.">".$caption."</option>\n";
	}

}

<?php
require_once('html_klasse.php');
require_once('persoon.php');
$persoon = new persoon();
$actie = "toevoegen";
$id = "";
$h = new html();
$h->tag("link","stylesheet","text/css","w3.css");
$h->form_start("w3-container","persoon_verwerking.php");
	$h->anchor("?c=personen&v=persoon_lijst","w3-btn w3-large w3-green w3-round","Lijst personen","p");
	$h->div_start("w3-container w3-pale-green w3-round");
		foreach ($persoon as $name => $value) {
			if ($name != "id") {
				$h->label("w3-label w3-text-teal",$name." *");
				$h->input("w3-input w3-border w3-light-grey","text",$name,$value,"required");
			}
		}
		$h->label("w3-left w3-text-teal","* = verplicht.");
		$h->label("w3-label","&nbsp;");
		$h->div_start("w3-center");
			$h->button("w3-btn w3-blue-grey w3-round w3-center","submit",$actie);
			$h->button("w3-btn w3-blue-grey w3-round w3-right","reset","Leegmaken");
		$h->div_end();
	$h->div_end();
	$h->input("","hidden","actie",$actie);
	$h->input("","hidden","id",$id);
$h->form_end();
echo $h->toon();