PHP 函数在不同开发阶段的应用策略？

function create_product($name, $description, $price) { ... }function get_product($id) { ... }function update_product($id, $name, $description, $price) { ... }function delete_product($id) { ... }

create_product() -> get_product() -> update_product() -> delete_product()

$name = 'T-shirt';$description = 'Black cotton T-shirt';$price = 19.99;$product_id = create_product($name, $description, $price);// ...$product = get_product($product_id);

$expected_name = 'T-shirt';$expected_description = 'Black cotton T-shirt';$expected_price = 19.99;$product = get_product(1);assert($product->name === $expected_name);assert($product->description === $expected_description);assert($product->price === $expected_price);