这是什么PHP语法？

Question

我最近看到一些样本PHP代码看起来像这样:

$myObj->propertyOne = 'Foo'
      ->propertyTwo = 'Bar'
      ->MethodA('blah');

相反:

$myObj->propertyOne = 'Foo';
$myObj->propertyTwo = 'Bar';
$myObj->MethodA('blah');

这是来自特定框架还是PHP的特定版本,因为我从未见过它的工作原理？

Answer 1

你看到的是fluent interface,但你的代码示例是错误的.长话短说,fluent setter应该返回$this:

class TestClass {
    private $something;
    private $somethingElse;

    public function setSomething($sth) {
        $this->something = $sth;

        return $this;
    }

    public function setSomethingElse($sth) {
        $this->somethingElse = $sth;

        return $this;
    }
}

用法:

$sth = new TestClass();
$sth->setSomething(1)
    ->setSomethingElse(2);