(PHP 5 >= 5.1.3, PHP 7, PHP 8)
ReflectionParameter::getDeclaringClass — Gets declaring class
此函数没有参数。
   A ReflectionClass object or null if called on function.
  
示例 #1 Getting the class that declared the method
<?php
class Foo
{
    public function bar(\DateTime $datetime)
    {
    }
}
class Baz extends Foo
{
}
$param = new \ReflectionParameter(['Baz', 'bar'], 0); 
var_dump($param->getDeclaringClass());
以上例程会输出:
object(ReflectionClass)#2 (1) {
  ["name"]=>
  string(3) "Foo"
}