# FAQ: Intro to Built-in PHP Functions - Number Functions

This community-built FAQ covers the “Number Functions” exercise from the lesson “Intro to Built-in PHP Functions”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Learn PHP

## FAQs on the exercise Number Functions

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My only comment to fellow noobs, Google is your friend. Personally, I don’t believe the program did the best job explaining the syntax of custom functions. As a result, it took some experimenting to understand passing an argument, calling aforementioned argument and finally the use of return. However, I am not complaining because I imagine this is what much of coding is.

2 Likes

I second this. The requirements on the first exercise are misleading.

2 Likes

hello, can anybody explain what’s wrong with my code in this exercise? Thanks

instruction:
Write a function called `calculateDistance()` that calculates the distance between two numbers. The function should return the same result for two arguments no matter what order they’re passed into the function. Your function should return 100 when invoked with -1 and 99 as arguments.

my code, which doesn’t get accepted and won’t pass me through to the next exercise

function calculateDistance(\$num1,\$num2){
echo abs(\$num1)+ abs(\$num2);
};
echo calculateDistance (99,-1);

code provided in the ‘view solution’:

function calculateDistance(\$first, \$second){
return abs(\$first - \$second);
};