PHP Recursive Implementation hierarchical tree expansion, php recursive Hierarchy Tree

PHP Recursive Implementation hierarchical tree expansion, php recursive 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'],);} // arrange the data according to indentation. See figure 1 function data2arr ($ tree, $ rootId = 0, $ le Vel = 0) {foreach ($ tree as $ leaf) {if ($ leaf ['fid'] = $ rootId) {echo str_repeat ('', $ level ). $ leaf ['id']. ''. $ leaf ['name']. '<br/>'; foreach ($ tree as $ l) {if ($ l ['fid'] = $ leaf ['id']) {data2arr ($ tree, $ leaf ['id'], $ level + 1); break ;}}} data2arr ($ data ); echo '<br/> --------------------------------------------------------------------- <br/>'; // encapsulate the data according to its relationship. See 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 '<br/> encode <br/>'; // set Use HTML to display data again. See figure 3 function tree2html ($ tree) {echo '<ul>'; foreach ($ tree as $ leaf) {echo '<li> '. $ leaf ['name']; if (! Emptyempty ($ leaf ['children ']) tree2html ($ leaf ['children']); echo '</li>';} echo '</ul> ';} tree2html ($ tree );

The above is all the content of this article. I hope it will help you learn php programming.

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