PHP整洁之道节选
函数
函数参数最好少于2个
限制函数参数个数极其重要因为它是你函数测试容易点。有超过3个可选参数参数导致一个爆炸式组合增长，你会有成吨独立参数情形要测试。
无参数是理想情况。1个或2个都可以，最好避免3个。再多旧需要加固了。通常如果你的函数有超过两个参数，说明他多做了一些事。 在参数少的情况里，大多数时候一个高级别对象（数组）作为参数就足够应付。
Bad:
function createMenu($title, $body, $buttonText, $cancellable) {
// ...
}Good:
class menuConfig() {
public $title;
public $body;
public $buttonText;
public $cancellable = false;
}
$config = new MenuConfig();
$config->title = 'Foo';
$config->body = 'Bar';
$config->buttonText = 'Baz';
$config->cancellable = true;
function createMenu(MenuConfig $config) {
// ...
}
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