Php Help for a newbie
so Im really new to php. I have a couple of study questions that I cant seem to start off or need a hint to figure out. 

1. how can I write a function that add two numbers as arguments from outside the function and returns the sum of those numbers?

2.how to write a loop that outputs a series of numbers from 20 to 0 in increments of 2.(20,18,16...)

3. How to write a code block that checks a value $x and outputs 'negative','positive' or 'zero'

Php Help for a newbie
===

so Im really new to php. I have a couple of study questions that I cant seem to start off or need a hint to figure out. 

1. how can I write a function that add two numbers as arguments from outside the function and returns the sum of those numbers?

2.how to write a loop that outputs a series of numbers from 20 to 0 in increments of 2.(20,18,16...)

3. How to write a code block that checks a value $x and outputs 'negative','positive' or 'zero'
