CODEWITHSUNDEEP
phparraysmultidimensional-arrayforeach
Pim
Pim

Reputation: 443

Looping through multiple php arrays to change value

I have an array $users as such:

  [0] => Array (
    [userid] => 1
    [score] => 9.9
  )
  [1] => Array (
    [userid] => 2
    [score] => 9
  )

For each user, I then retrieve items and store them into an array, $results:

foreach ($users as $user) {
  $items = getItems($user['userid']);
  $results[] = $items:
}

The $results array ends up looking like this:

[0] => Array (
  [0] => Array (
    [itemid] => 1
    [rating] => 9.9
  )
  [1] => Array (
    [itemid] => 2
    [rating] => 9
  )
)
[1] => Array (
  [0] => Array (
    [itemid] => 3
    [rating] => 8.5
  )
  [1] => Array (
    [itemid] => 2
    [rating] => 7.5
  )
)

What I would like to do, is weigh the item rating with the user score. So, for each item, the rating would be multiplied by user score * 0.1.

What I've tried is this:

foreach ($users as $user) {
  $items = getItems($user['id']);
  foreach ($items as $item) {
    $item['rating'] = $item['rating'] * $user['score'] * 0.1;
  }
  $results[] = $items:
}

but to no avail. What am I doing wrong and how do I get the desired result?

Upvotes: 0

Views: 112

Answers (1)

Ajay Singh Deopa
Ajay Singh Deopa

Reputation: 146

By default in foreach the value is passed by value. So even if you change the data inside of an array inside the loop it will not be reflected. So you have to use & before $item to pass the array data by reference.

You can learn more about it here http://php.net/manual/en/control-structures.foreach.php

Upvotes: 1

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