简单示意一下：
class test {
private $_name = '';
public function setName($name)
{
$this->_name = $name;
return $this;
}
public function getName()
{
echo $this->_name . "\n";
return $this;
}
}
$link = new test();
// 方法链
$link->setName('name1')->getName()->setName('name2')->getName()->setName('name3')->getName();
结果如下：
name1
name2
name3
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