Undefined constant CodeIgniter\Router\Router::HTTP_METHODS

According to the PHP Manual:

class constant are by default public in nature but they cannot be assigned visibility factor and in turn gives syntax error.

PHP Code:

<?php

class constants {

    const MAX_VALUE = 10;
        public const MIN_VALUE =1;

}

// This will work
echo constants::MAX_VALUE;

// This will return syntax error 
echo constants::MIN_VALUE; 
?>

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