Traversal output of Binary Tree array in phpFLEA

Recently, I was working on a project involving "unlimited reply". FLEA has an auxiliary class for arrays: FLEA_Helper_Array, which has a very powerful array processing method: array_to_tree, this method can convert a two-dimensional array into a binary tree structure. but how can we traverse the binary tree array produced by this method? My practice is as follows:

Copy codeThe code is as follows:
Function preTree ($ cat ){
Foreach ($ cat as $ c ){
?>

"> :

• "> :

  
  If (isset ($ s ['childrens']) {
  ?>
  • $ This-> preTree ($ s ['childrens']);
    ?>
  }
  ?>
  
  

}
}
?>