How does the PHP version affect the accessibility of constants within a class?

In PHP, the accessibility of constants within a class can be affected by the PHP version. In PHP 5, constants within a class are accessed using the `self::CONSTANT_NAME` syntax, while in PHP 7, they can also be accessed using the `ClassName::CONSTANT_NAME` syntax. To ensure compatibility across different PHP versions, it is recommended to use the `ClassName::CONSTANT_NAME` syntax for accessing constants within a class. 

class MyClass {
    const MY_CONSTANT = 'Hello';

    public function getConstant() {
        return self::MY_CONSTANT; // PHP 5
        // return MyClass::MY_CONSTANT; // PHP 7
    }
}

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