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<?php//case 28 体验类与对象//声明类class student1{    public $name;    public $student_id;    public $age;    public $gender;    public function introduce()    {        echo "大家好，我是{$this->name}，今年{$this->age}岁。<br>我的学号是{$this->student_id}，很高兴认识大家。<br>";    }    public function study($time)    {        $time = date("Y-m-d H:i:s",$time);        echo "当前时间为{$time},学习中，请勿打扰......<br>";    }}//实例化$stu = new student1();$stu->name = '小明';$stu->student_id = '20200111178';$stu->age = 18;$stu->gender = '男性';$stu2 = new student1();$stu2->name = '小红';$stu2->student_id = '20200111179';$stu2->age = 19;$stu2->gender = '女性';echo '<pre>';var_dump($stu,$stu2);echo '</pre>';$stu->introduce();$stu->study(time());$stu2->introduce();$stu2->study(time());