Can I access a PHP Class Constant using a variable for the constant name?

问题

When accessing a class constant I see that I can use a variable for the class name, e.g. $classname::CONST_VALUE.

What if I want to use a variable for the constant name, e.g. self::$constant. This does not seem to work. Is there a workaround?

回答1:

$variable = $classname.'::'.$constant;

constant($variable);

See the docs: http://php.net/constant

来源：https://stackoverflow.com/questions/11717593/can-i-access-a-php-class-constant-using-a-variable-for-the-constant-name