<?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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