Unset index of an array inside another array

Question

I have an array with in which there is another array. I need to unset a index of the sub array.

array
  0 => 
    array
      'country_id' => string '1' (length=1)
      'description' => string 'test' (length=4)
  1 => 
    array
      'country_id' => string '2' (length=1)
      'description' => string 'sel' (length=5)
  2 => 
    array
      'country_id' => string '3' (length=1)
      'description' => string 'soul' (length=5)

Now i need to unset country_id of all the three index of the master array. I am using PHP and I initially thought unset will do until i realized my array is nested.

How can I do this?

`foreach($array as &$element){unset($element['country_id'];}` — Steve, Sep 10 '14 at 12:33
possible duplicate of [PHP - unset in a multidimensional array](http://stackoverflow.com/questions/7260468/php-unset-in-a-multidimensional-array) — Joanvo, Sep 10 '14 at 12:52

DonCallisto · Accepted Answer · 2014-09-10T14:46:05.990

0

foreach ($original_array as &$element) {
  unset($element['country_id']);
}

why &$element?

Because foreach (...) will perform a copy, so we need to pass the reference to the "current" element in order to unset it (and not his copy)

edited Sep 10 '14 at 14:46

answered Sep 10 '14 at 12:33

DonCallisto

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Tom · Answer 2 · 2014-09-10T12:39:42.413

foreach ($masterArray as &$subArray)
    unset($subArray['country_id']);

The idea is that you take each sub array by reference and unset the key within that.

EDIT: another idea, just to make things interesting, would be to use the array_walk function.

array_walk($masterArray, function (&$item) { unset ($item['country_id']); });

I'm not sure that it's any more readable, and the function call will make it slower. Still, the option is there.

score 0 · Answer 3 · answered Sep 10 '14 at 12:35

0

foreach($yourArray as &$arr)
{
   unset($arr['country_id']);
}

answered Sep 10 '14 at 12:35

Sadikhasan

18,365
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score 0 · Answer 4 · answered Sep 10 '14 at 12:46

You need to use:

foreach ($array as &$item) {
  unset($item['country_id']);
}

but after loop you should really unset reference otherwise you might get into trouble so the correct code is:

foreach ($array as &$item) {
  unset($item['country_id']);
}
unset($item);

Unset index of an array inside another array

4 Answers4