How to implement recursive and infinite classification in php, how to implement recursive classification in php_PHP tutorial

How to implement recursive and infinite classification in php, how to implement recursive classification in php

The example in this article describes the method of implementing recursion and infinite classification in PHP, and shares it with everyone for your reference. The specific implementation method is as follows:

<&#63;php
echo "<pre class="brush:php;toolbar:false">";
$area = array(
array('id'=>1,'area'=>'北京','pid'=>0),
array('id'=>2,'area'=>'广西','pid'=>0),
array('id'=>3,'area'=>'广东','pid'=>0),
array('id'=>4,'area'=>'福建','pid'=>0),
array('id'=>11,'area'=>'朝阳区','pid'=>1),
array('id'=>12,'area'=>'海淀区','pid'=>1),
array('id'=>21,'area'=>'南宁市','pid'=>2),
array('id'=>45,'area'=>'福州市','pid'=>4),
array('id'=>113,'area'=>'亚运村','pid'=>11),
array('id'=>115,'area'=>'奥运村','pid'=>11),
array('id'=>234,'area'=>'武鸣县','pid'=>21)
); 

function t($arr,$pid=0,$lev=0){
 static $list = array();
 foreach($arr as $v){
 if($v['pid']==$pid){
  echo str_repeat("  ",$lev).$v['area']."<br />";
  //这里输出，是为了看效果
  $list[] = $v;
  t($arr,$v['id'],$lev+1);
 } 
 }
 return $list;
}
$list = t($area);
echo "<hr >";
print_r($list);
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.

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