Detailed explanation of PHP recursion and infinite classification examples

This article mainly introduces the method of realizing recursion and infinite classification in PHP, involving the recursive operation skills of PHP. Friends who need it can refer to it

The example of this article describes the method of realizing recursion and infinite classification in PHP.

The specific implementation method is as follows:

<?php
echo "<pre class="brush:php;toolbar:false">";
$area = array(
array(&#39;id&#39;=>1,&#39;area&#39;=>&#39;北京&#39;,&#39;pid&#39;=>0),
array(&#39;id&#39;=>2,&#39;area&#39;=>&#39;广西&#39;,&#39;pid&#39;=>0),
array(&#39;id&#39;=>3,&#39;area&#39;=>&#39;广东&#39;,&#39;pid&#39;=>0),
array(&#39;id&#39;=>4,&#39;area&#39;=>&#39;福建&#39;,&#39;pid&#39;=>0),
array(&#39;id&#39;=>11,&#39;area&#39;=>&#39;朝阳区&#39;,&#39;pid&#39;=>1),
array(&#39;id&#39;=>12,&#39;area&#39;=>&#39;海淀区&#39;,&#39;pid&#39;=>1),
array(&#39;id&#39;=>21,&#39;area&#39;=>&#39;南宁市&#39;,&#39;pid&#39;=>2),
array(&#39;id&#39;=>45,&#39;area&#39;=>&#39;福州市&#39;,&#39;pid&#39;=>4),
array(&#39;id&#39;=>113,&#39;area&#39;=>&#39;亚运村&#39;,&#39;pid&#39;=>11),
array(&#39;id&#39;=>115,&#39;area&#39;=>&#39;奥运村&#39;,&#39;pid&#39;=>11),
array(&#39;id&#39;=>234,&#39;area&#39;=>&#39;武鸣县&#39;,&#39;pid&#39;=>21)
); 

function t($arr,$pid=0,$lev=0){
 static $list = array();
 foreach($arr as $v){
 if($v[&#39;pid&#39;]==$pid){
  echo str_repeat("  ",$lev).$v[&#39;area&#39;]."<br />";
  //这里输出，是为了看效果
  $list[] = $v;
  t($arr,$v[&#39;id&#39;],$lev+1);
 } 
 }
 return $list;
}
$list = t($area);
echo "<hr >";
print_r($list);
?>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's learning.

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