php类知识---常量点滴

<?php
class mycoach
{
    public $name="陈培昌";
    CONST hisage =22;
    public $age=22;
    private $favorite = "喜欢丁大锅";
    public function __construct()
    {
        echo $this->name."芳龄".mycoach::hisage.$this->favorite.PHP_EOL;
        echo "常量不可以放在双引号中取值:-------陈培昌弟弟芳龄mycoach::hisage".PHP_EOL;
        echo "变量可以放在双引号中取值:-------陈培昌弟弟芳龄$this->age".PHP_EOL;
    }
    public function __get($key)
    {
        return $this->$key;
    }
    public function __set($key,$value)
    {
        $this->$key = $value;
    }
}
$cpc = new mycoach();
?>