<?php

class Person

{

    public $name;

    public $sex;

    public function __construct($name,$sex=1)

    {

        $this->name = $name;

        $this->sex = $sex;

    }

    public function getName()

    {

        return $this->name;

    }

}

$reflect = new ReflectionClass('Person');

$constructor = $reflect->getConstructor ();

$res = $reflect->newInstanceArgs(['name'=>'wang']) ;

var_dump($res->getName());

?>