PHP recursive implementation hierarchy tree expansion, php recursive hierarchy tree _ PHP Tutorial

PHP recursion implements hierarchical tree expansion, and php recursion hierarchy tree. PHP recursive implementation hierarchical tree expansion, php recursive hierarchy tree this article examples for you to share the main code of PHP recursive implementation hierarchical tree expansion, for your reference, the specific content is as follows: PHP recursively implements hierarchical tree expansion, and php recursion hierarchy tree

The examples in this article share the main code for the hierarchical tree expansion of PHP recursive implementation for your reference. the specific content is as follows:

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Implementation code:

<? Php $ db = mysql_connect ('localhost', 'root', 'root') or die ('Can \'t connect to database'); mysql_select_db ('test ') or die ('Can \'t find database: test'); $ result = mysql_query ('select id, fid, name from tree '); while ($ arr = mysql_fetch_array ($ result) {$ data [] = array ('id' => $ arr ['id'], 'fid' => $ arr ['fid'], 'name' => $ arr ['name'],);} // sort data by indentation. for details, see function data2arr ($ tree, $ rootId = 0, $ level = 0) {foreach ($ tree as $ leaf) {if ($ leaf ['fid'] = $ rootId) {echo str_repeat ('', $ level ). $ leaf ['id']. ''. $ leaf ['name'].'
'; Foreach ($ tree as $ l) {if ($ l ['fid'] = $ leaf ['id']) {data2arr ($ tree, $ leaf ['id'], $ level + 1); break ;}}} data2arr ($ data); echo'
-----------------------------------------------------------------------
'; // Encapsulate data according to the link. for details, see function arr2tree ($ tree, $ rootId = 0) {$ return = array (); foreach ($ tree as $ leaf) {if ($ leaf ['fid'] = $ rootId) {foreach ($ tree as $ subleaf) {if ($ subleaf ['fid'] = $ leaf ['id']) {$ leaf ['Children '] = arr2tree ($ tree, $ leaf ['id']); break ;}$ return [] = $ leaf ;}return $ return ;}$ tree = arr2tree ($ data ); print_r ($ tree); echo'
-----------------------------------------------------------------------
'; // Use HTML to display data again. for details, see function tree2html ($ tree) {echo'
 
 

  
  
'; Foreach ($ tree as $ leaf) {echo'
  
  
'. $ Leaf ['name']; if (! Emptyempty ($ leaf ['Children ']) tree2html ($ leaf ['Children']); echo'
';} Echo'
 
 
';} Tree2html ($ tree );

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Examples in this article share the main code of hierarchical tree expansion for PHP recursion implementation for your reference. the specific content is as follows...