PHP example analyzes the concept of class constants in PHP

This article mainly introduces PHP examples and analyzes the concept of class constants in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

The examples in this article describe the usage of PHP class constants, as follows:

'; echo Foo::BAR, '
'; $obj = new Foo(); echo $obj->getConstant(), '
'; echo $obj->getConstantValue(), '
'; echo Foo::getConstantValue(); // 以上均输出bar class Bar extends Foo { const BAR = 'foo'; // 重写父类常量 public static function getMyConstant() { return self::BAR; } public static function getParentConstant() { return parent::BAR; } } echo Bar::getMyConstant(); // foo echo Bar::getParentConstant(); // bar

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