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วิธีนี้ เป็นวิธีช่วย ให้เราสามารถจัดการกับหมวดหมู่ที่มีหมวดหมู่ย่อยได้ง่ายขึ้น

$categories = array(
array('id' => 1, 'parent' => 0, 'name' => 'Category A'),
array('id' => 2, 'parent' => 0, 'name' => 'Category B'),
array('id' => 3, 'parent' => 0, 'name' => 'Category C'),
array('id' => 4, 'parent' => 0, 'name' => 'Category D'),
array('id' => 5, 'parent' => 0, 'name' => 'Category E'),
array('id' => 6, 'parent' => 2, 'name' => 'Subcategory F'),
array('id' => 7, 'parent' => 2, 'name' => 'Subcategory G'),
array('id' => 8, 'parent' => 3, 'name' => 'Subcategory H'),
array('id' => 9, 'parent' => 4, 'name' => 'Subcategory I'),
array('id' => 10, 'parent' => 9, 'name' => 'Subcategory J'),
);

function categoriesToTree(&$categories) {

$map = array(
0 => array('subcategories' => array())
);

foreach ($categories as &$category) {
$category['subcategories'] = array();
$map[$category['id']] = &$category;
}

foreach ($categories as &$category) {
$map[$category['parent']]['subcategories'][] = &$category;
}

return $map[0]['subcategories'];

}

echo "=== BEFORE ===
";
print_r ($categories);

$tree = categoriesToTree($categories);

echo "=== TREE ===
";
print_r ($tree);


ขอขอบคุณข้อมูลจาก http://stackoverflow.com/questions/4843945/php-tree-structure- for-categories-and-sub-categories-without-looping-a-query