The simplest solution would be to move those functions into static methods
of classes. Place one class in each file to organize your functions and use
an autoloader to load the classes. You don't need to instantiate the class
to use the autoloader--just reference it statically:

    // library/Math.php
    class Math {
        const PI = 3.14159;

        public static function sin($radians) {...}
    }

    ...

    $x = $radius * Math::cos(Math::PI * 0.5);

David

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