PHP递归实现层级树状展开-PHP源码

本文实例为大家分享了PHP递归实现层级树状展开的主要代码，供大家参考，具体内容如下

效果图：

实现代码：

 $arr[&＃39;id&＃39;],  
    &＃39;fid&＃39; => $arr[&＃39;fid&＃39;], 
    &＃39;name&＃39; => $arr[&＃39;name&＃39;],  
  ); 
} 
  
// 将数据按照缩进简单排列 见图1 
function data2arr($tree, $rootId = 0, $level = 0) { 
  foreach($tree as $leaf) { 
    if($leaf[&＃39;fid&＃39;] == $rootId) { 
      echo str_repeat(&＃39;    &＃39;, $level) . $leaf[&＃39;id&＃39;] . &＃39; &＃39; . $leaf[&＃39;name&＃39;] . &＃39;
&＃39;; 
      foreach($tree as $l) { 
        if($l[&＃39;fid&＃39;] == $leaf[&＃39;id&＃39;]) { 
          data2arr($tree, $leaf[&＃39;id&＃39;], $level + 1); 
          break; 
        } 
      } 
    } 
  } 
} 
  
data2arr($data); 
echo &＃39;
-----------------------------------------------------------------------
&＃39;; 
  
// 将数据按照所属关系封装 见图2 
function arr2tree($tree, $rootId = 0) { 
  $return = array(); 
  foreach($tree as $leaf) { 
    if($leaf[&＃39;fid&＃39;] == $rootId) { 
      foreach($tree as $subleaf) { 
        if($subleaf[&＃39;fid&＃39;] == $leaf[&＃39;id&＃39;]) { 
          $leaf[&＃39;children&＃39;] = arr2tree($tree, $leaf[&＃39;id&＃39;]); 
          break; 
        } 
      } 
      $return[] = $leaf; 
    } 
  } 
  return $return; 
} 
  
$tree = arr2tree($data); 
print_r($tree); 
echo &＃39;
-----------------------------------------------------------------------
&＃39;; 
  
// 将数据使用HTML再次展现 见图3 
function tree2html($tree) { 
  echo &＃39;
&＃39;; 
  foreach($tree as $leaf) { 
    echo &＃39;
&＃39; .$leaf[&＃39;name&＃39;]; 
    if(! emptyempty($leaf[&＃39;children&＃39;])) tree2html($leaf[&＃39;children&＃39;]); 
    echo &＃39;
&＃39;; 
  } 
  echo &＃39;
&＃39;; 
} 
  
tree2html($tree);

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。