PHP延迟静态绑定示例分享

<?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>';

// 

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