[kijin]

I have a similar dilemma with some of my helper functions. For example, I have starts_with(), ends_with(), and contains() for super easy string comparisons, is_between() for numerical comparisons, and custom implementations for a few built-in functions such as hex2bin() that don't exist in older versions. These are so general in scope that it would be awkward to place them in their own \Namespace\Class.

[rmrfrmrf]

I'd probably break them all down into classes based on function (EasyString, EasyNumber, BuiltIn).

    namespace App\Library;
    class EasyString {
        public static function starts_with();
        ...
    }

and then just use them like this:

    use App\Library\EasyString as ES;

along with an autoloader.