PHP recursive hierarchical tree-like deployment, PHP recursive hierarchy tree _php tutorial

PHP recursive implementation of hierarchical tree expansion, PHP recursive hierarchy tree-like

This example for everyone to share the PHP recursive implementation of hierarchical tree-like expansion of the main code for your reference, the specific content 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 ' = = $arr [' name '],);  }//The data is indented in a simple arrangement as shown in Figure 1 function Data2arr ($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 '
-----------------------------------------------------------------------
';   Enclose the data in the owning relationship as shown in Figure 2 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 ($tree); Echo '
-----------------------------------------------------------------------
'; Using HTML again to show the data as shown in Figure 3 function tree2html ($tree) {echo '
 
 

  
  

    '; foreach ($tree as $leaf) {echo ' 
   
'. $leaf [' name ']; if (! emptyempty ($leaf [' Children '])) tree2html ($leaf [' Children ']); Echo '
'; } Echo ' 
  
 
 
'; } tree2html ($tree);

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