Online PHP editor | refs for ThcGX

<?php trait T { static $arr = []; public static function a() { self::$arr[] = 'Tx'; static::$arr[] = 'Ty'; } } class C { use T; public static function b() { self::$arr[] = 'Cx'; static::$arr[] = 'Cy'; } } class D { use T; public static function b() { self::$arr[] = 'Dx'; static::$arr[] = 'Dy'; } } T::a(); // make no sense C::a(); C::b(); D::a(); D::b(); assert(C::$arr === ['Tx', 'Ty', 'Cx', 'Cy']); assert(D::$arr === ['Tx', 'Ty', 'Dx', 'Dy']); T::a(); // make no sense assert(C::$arr === ['Tx', 'Ty', 'Cx', 'Cy']); assert(D::$arr === ['Tx', 'Ty', 'Dx', 'Dy']);