Online PHP editor | output for KQ8dM

<?php $category = [ [ 'sort_id' => 11, 'sort_name' => '一级目录', 'sort_child' => 0 ], [ 'sort_id' => 12, 'sort_name' => '二级目录', 'sort_child' => 11 ], [ 'sort_id' => 13, 'sort_name' => '二级目录', 'sort_child' => 11 ], [ 'sort_id' => 14, 'sort_name' => '三级目录', 'sort_child' => 13 ], [ 'sort_id' => 15, 'sort_name' => '三级目录', 'sort_child' => 13 ], [ 'sort_id' => 16, 'sort_name' => '三级目录', 'sort_child' => 13 ], [ 'sort_id' => 17, 'sort_name' => '一级目录2', 'sort_child' => 0 ], [ 'sort_id' => 18, 'sort_name' => '三级目录', 'sort_child' => 12 ], [ 'sort_id' => 19, 'sort_name' => '三级目录', 'sort_child' => 12 ] ]; $newCategory = []; processCategory($category, 0, $newCategory); $leave = 0; foreach ($newCategory as $currentCategory) { echo $currentCategory['sort_name']; } function processCategory(&$category, $parrentId, &$newCategory) { foreach ($category as $currentCategory) { if ($currentCategory['sort_child'] != $parrentId) continue; array_push($newCategory, $currentCategory); processCategory( $category, $currentCategory['sort_id'], $newCategory ); } }