php类相关知识----类常量，静态变量

<?php
class myuser
{
const age=;//定义的常量不带$符号,常量之前没有访问修饰符,常量之前没有修饰符号
public function monolog()
{
echo "今年".self::age,"岁了，想做程序员，还有戏么"."\n";
echo "什么？你已经".$this::age."了，都？"."\n";
}
}$dy = new myuser();
$dy->monolog();
echo "今年我".$dy::age."岁了"."\n";
echo "今年我".myuser::age."岁了"."\n";
?>

<?php
class wenwa
{
public static $rules = "不准用手机"."\n";
static public $name = "my name is taliban"."\n";
public static function self_introduce()
{
echo "there is a game of love"."\n";
}
}
$duwa = 'wenwa';
$saiwa = new $duwa;
$saiwa::self_introduce();
echo wenwa::$name;
?>