php trait和class的区别，trait复用代码，static方法和普通方法的区别

trait zx
{
//    const sss = 9;

    public static function tt()
    {
        echo ‘tt‘;
    }

    public function yy()
    {
        echo ‘yy‘;
    }
}

class uu
{
    use zx;

    const rr = 0;

    public static function ty()
    {
        echo ‘ty‘;
    }

    public function yu()
    {
        echo ‘yu‘;
    }

}

uu::tt();
echo ‘<br>‘;

uu::ty();
echo ‘<br>‘;

$u = new uu();
$u->yu();
echo ‘<br>‘;

$u->yy();