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I haven’t used this new feature much, but it’s actually not new. Give it a try, inheritance of static classes is very convenient now
<?php class A { protected static $def = '123456'; public static function test() { echo get_class(new static); } public static function test2() { echo static::$def; } } class B extends A { protected static $def = '456789'; } class C extends A { protected static $def = 'abcdef'; } echo B::test(); echo '<br>'; echo C::test(); echo '<br>'; echo B::test2(); echo '<br>'; echo C::test2(); echo '<br>'; echo A::test(); echo '<br>'; echo A::test2(); echo '<br>';
// 输出结果 B C 456789 abcdef A 123456
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