类函数,=>,->,::,self,$this用法

<?php
//比较最大数值
class Math{
    public static function Max($num1, $num2){
        return $num1 > $num2 ? $num1 : $num2;
    }
}
    $a = 1000;     
    $b = 5000;     
    echo "显示 $a 和 $b 中的最大值是";
    echo Math::Max($a, $b); //返回5000

    
    
//类函数,=>,->,::,self,$this用法
class User{
    var $userData = array(
        'name'    => 'zhou_ein',
        'gender'  => '男',
        'age'     => 18,
    );
    public static $Data = array(
        'name'    => 'zhouEin',
        'gender'  => '男',
        'age'     => 16,
    );
    public $name  = '钢锅';
    public static $gender = '男';
    var $age = 20;

    function getData(){
        $data[] = $this -> name;
        $data[] = self :: $gender;
        $data[] = $this -> age;
        $data[] = $this -> userData;
        $data[] = self :: $Data;
        return $data;
    }
}
    $data = new User;
    
    echo $data -> name;   //钢锅
    echo User :: $gender;  //男
    echo $data -> age;    //20
    
    var_dump($data -> getData());  //返回所有数组和变量