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PHP Build a Simple PHP Application Working With Functions Introducing User-Defined Functions

Posted by Jason Chiu
Jason Chiu
4,373 Points

Code Challenge Task # 3

Hi can someone help me solve task #3 for this challenge and explain the concept? I am confusing here.

palindromic_primes.php 
<?php 
function mimic_array_sum ($array) {
  $sum = 0;
  foreach($array as $arr => $element) {
    $sum+=$element;
  }
 return $sum; 
}  

$sum = mimic_array_sum ($array); 
echo $sum;


$palindromic_primes = array(11, 757, 16361);

?>

1 Answer

Grace Kelly
Grace Kelly
33,990 Points
Grace Kelly
Grace Kelly
33,990 Points

Hi Jason,

The task asks for you to create a function that can add a number of values, you've got the right idea with your code, except you don't need the => element as you're not dealing with associative arrays in this case!! If you remove that from your foreach loop and instead add the $arr value to your $sum variable it should work fine!! Here's an example of how the function could look: 

<?php 

function mimic_array_sum($array) {
  $total = 0;
  foreach($array as $arr) { //loop through each element in the array
  $total+= $arr; // add the element to $total
  }
  return $total;
}
?>

now, looking to apply it to the $palindromic_primes array, you need to pass the array through the mimic_array_sum function in order for it to work, like so: 

<?php
$palindromic_primes = array(11, 757, 16361);

$sum = mimic_array_sum($palindromic_primes); //pass the $palindromic_primes array through the function

echo $sum;
?>

Hope this helps!!