In PHP when you define a class level constant as in:
const MY_CONSTANT = 'hello constant';
Why can’t you initialize this value with a function such as
const MY_FILEPATH = dirname(dirname(__FILE__)) . '/heres-my-file.php';
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Answer
In short: The constants are replaced while parsing, but functions are executed while interpreting. The parser simply cannot know to what it should set the value of the content.