Rename the function name

[leyluj]

Changed the name to avoid conflict with illuminate helpers

[panlatent]

@leyluj

Hi, this function has the same name as the Laravel function. But what kind of situation I am more interested in is that you will introduce 2 frameworks in a same project? This is a library for Yii2. levn doesn't make much sense. If you really think this is a problem, I think you can provide a more creative name. Thanks again

Thanks again.