PHP unlimited classification tree data formatting code example detailed explanation-PHP Tutorial-php.cn

PHP unlimited classification tree data formatting code example detailed explanation

墨辰丷

Release： 2023-03-28 20:58:02

Original

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This article mainly introduces the PHP unlimited classification tree data formatting code. Friends who need it can refer to the

original code:

function genTree($items,$id=&#39;id&#39;,$pid=&#39;pid&#39;,$son = &#39;children&#39;){
  $tree = array(); //格式化的树
  $tmpMap = array(); //临时扁平数据
   
  foreach ($items as $item) {
    $tmpMap[$item[$id]] = $item;
  }
   
  foreach ($items as $item) {
    if (isset($tmpMap[$item[$pid]])) {
      $tmpMap[$item[$pid]][$son][] = &$tmpMap[$item[$id]];
    } else {
      $tree[] = &$tmpMap[$item[$id]];
    }
  }
  unset($tmpMap);
  return $tree;
}
 
$items1 = array(
    array(&#39;id&#39; => 1, &#39;pid&#39; => 0, &#39;name&#39; => &#39;一级11&#39; ),
    array(&#39;id&#39; => 11, &#39;pid&#39; => 0, &#39;name&#39; => &#39;一级12&#39; ),
    array(&#39;id&#39; => 2, &#39;pid&#39; => 1, &#39;name&#39; => &#39;二级21&#39; ),
    array(&#39;id&#39; => 10, &#39;pid&#39; => 11, &#39;name&#39; => &#39;二级22&#39; ),
    array(&#39;id&#39; => 3, &#39;pid&#39; => 1, &#39;name&#39; => &#39;二级23&#39; ),
    array(&#39;id&#39; => 12, &#39;pid&#39; => 11, &#39;name&#39; => &#39;二级24&#39; ),
    array(&#39;id&#39; => 9, &#39;pid&#39; => 1, &#39;name&#39; => &#39;二级25&#39; ),
    array(&#39;id&#39; => 14, &#39;pid&#39; => 1, &#39;name&#39; => &#39;二级26&#39; ),
    array(&#39;id&#39; => 4, &#39;pid&#39; => 9, &#39;name&#39; => &#39;三级31&#39; ),
    array(&#39;id&#39; => 6, &#39;pid&#39; => 9, &#39;name&#39; => &#39;三级32&#39; ),
    array(&#39;id&#39; => 7, &#39;pid&#39; => 4, &#39;name&#39; => &#39;四级41&#39; ),
    array(&#39;id&#39; => 8, &#39;pid&#39; => 4, &#39;name&#39; => &#39;四级42&#39; ),
    array(&#39;id&#39; => 5, &#39;pid&#39; => 4, &#39;name&#39; => &#39;四级43&#39; ),
    array(&#39;id&#39; => 13, &#39;pid&#39; => 4, &#39;name&#39; => &#39;四级44&#39; ),
    array(&#39;id&#39; => 15, &#39;pid&#39; => 8, &#39;name&#39; => &#39;五级51&#39; ),
    array(&#39;id&#39; => 16, &#39;pid&#39; => 8, &#39;name&#39; => &#39;五级52&#39; ),
    array(&#39;id&#39; => 17, &#39;pid&#39; => 8, &#39;name&#39; => &#39;五级53&#39; ),
    array(&#39;id&#39; => 18, &#39;pid&#39; => 16, &#39;name&#39; => &#39;六级64&#39; ),
); 
var_dump(genTree($items1));

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# #The following is a supplement:

/**
 * 此方法由@Tonton 提供
 * http://my.oschina.net/u/918697
 * @date 2012-12-12
 */
function genTree5($items) {
  foreach ($items as $item)
    $items[$item[&#39;pid&#39;]][&#39;son&#39;][$item[&#39;id&#39;]] = &$items[$item[&#39;id&#39;]];
  return isset($items[0][&#39;son&#39;]) ? $items[0][&#39;son&#39;] : array();
}

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Extremely Simple and effective! ! ! Very useful!

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

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