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PHP Build a Simple PHP Application Working With Functions Introducing Functions

Posted by Stormy Silver
Stormy Silver
9,240 Points

Help please

The code below creates an array of numbers, loops through them one at a time, and sums their values. PHP actually has a native function that does this same thing: array_sum(). [The array_sum() function receives an array as its one and only argument, and it sends back the sum as the return value.] Modify the code below: remove the foreach loop and the working sum variable, replacing them with a call to the array_sum() function instead.

<?php

$numbers = array(1,5,8);

$sum = 0; foreach($numbers as $number) { $sum = $sum + $number; }

echo $sum; ?>

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

what have you tried so far?

1 Answer

Anna Petry
Anna Petry
14,474 Points
Anna Petry
Anna Petry
14,474 Points

If you call the 'array_sum' function, you'll need to pass it an array, like this:

array_sum($argument);

In this case your array is stored in the variable $numbers.

The function will add all of the values in your array and return the sum. In order to print/echo that return value to the screen, you need to use the keyword 'echo' before your function call, like this:

echo array_sum($argument);

Functions are super cool and powerful, but in order to use them effectively, you must assign their return value to a variable, echo it to the screen, or use that value in another function call, depending on the application.

Hope this helps!