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CREATE TABLE categories ( id INT PRIMARY KEY, name VARCHAR(255) NOT NULL, parent INT ); INSERT INTO categories (id, name, parent) VALUES (1, 'shoes', 0), (2, 'women_shoes', 1), (3, 'man_shoes', 1), (4, 'sweets', 0), (5, 'man_sweets', 4), (6, 'women_sweets', 4), (7, 'women_red_sweets', 6), (8, 'women_green_sweets', 6), (9, 'men_blue_sweets', 5);
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<?php function categories_list($mysqli, $id = 0) { $list = []; $result = $mysqli->execute_query("SELECT * FROM categories WHERE parent = ?", $id); foreach ($result as $value) { $list[] = $value['id']; array_push($list, ...categories_list($mysqli, $value['id'], $list)); } return array_unique($list); } var_export(categories_list($mysqli));
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