This article mainly introduces the php recursive method to implement unlimited classification, involves the skills related to php recursive traversal, and has some reference value, for more information, see the example in this article. Share it with you for your reference. The details are as follows:
<?php$rows = array( array( 'id' => 1, 'name' => 'dev', 'parentid' => 0 ), array( 'id' => 2, 'name' => 'php', 'parentid' => 1 ), array( 'id' => 3, 'name' => 'smarty', 'parentid' => 2 ), array( 'id' => 4, 'name' => 'life', 'parentid' => 0 ), array( 'id' => 5, 'name' => 'pdo', 'parentid' => 2 ), array( 'id' => 6, 'name' => 'pdo-mysql', 'parentid' => 5 ), array( 'id' => 7, 'name' => 'java', 'parentid' => 1 ));// 72648// 84072function findChild(&$arr,$id){ $childs=array(); foreach ($arr as $k => $v){ if($v['parentid']== $id){ $childs[]=$v; } } return $childs;}function build_tree($root_id){ global $rows; $childs=findChild($rows,$root_id); if(empty($childs)){ return null; } foreach ($childs as $k => $v){ $rescurTree=build_tree($v[id]); if( null != $rescurTree){ $childs[$k]['childs']=$rescurTree; } } return $childs;}$tree=build_tree(0);echo memory_get_usage();print_r($tree);?>
I hope this article will help you with php programming.