PHP 生成 Html

 1 <?php
 2 
 3 /**
 4 
 5 生成：<form id="form"><label><b>用户名：</b><input name="usrname"></label></form>
 6 
 7 $form = Html::tag('form')->attr(['id' => 'form']);
 8 $label = Html::tag('label');
 9 $b = Html::tag('b');
10 $input = Html::tag('input')->attr('name', 'usrname');
11 
12 echo $form->add($label->add($b->add('用户名：'))->add($input))->make();
13 
14 */
15 
16 class Html{
17 
18     protected static $init = null;
19     protected $attr = [];
20     protected $tag = '';
21     protected $elements = [];
22     public $closings = ['br', 'hr', 'input', 'source', 'area', 'base', 'link', 'img', 'meta', 'basefont', 'param', 'col', 'frame', 'embed'];
23 
24     protected function __construct($tag){
25 
26         $this->tag = $tag;
27     }
28 
29     public static function tag($value){
30 
31         return new static($value);
32     }
33 
34     public function attr($name, $value = ''){
35 
36         if(is_array($name)){
37             $this->attr = $name + $this->attr;
38         }else{
39             $this->attr[$name] = $value;
40         }
41 
42         return $this;
43     }
44 
45     public function add($element){
46 
47         $this->elements[] = $element;
48         return $this;
49     }
50 
51     public function make(){
52 
53         $attr = array_reduce(array_keys($this->attr), function($carry, $item){
54             $carry .= ' ' .$item . '=' . '"'.$this->attr[$item] .'"' ;
55             return $carry;
56         });
57 
58         $html = '<'.$this->tag. $attr.'>';
59         //遍历子元素调用 make 方法，形成递归
60         foreach ($this->elements as $element){
61 
62             if(is_object($element)){
63                 $element = $element->make();
64             }
65             $html .= $element;
66         }
67 
68         if(!in_array($this->tag, $this->closings)) $html .= '</'.$this->tag.'>';
69 
70         return  $html;
71 
72     }
73 
74 
75 }