Adding key=>value pair to existing array with condition

Question

Im trying to add a key=>value to a existing array with a specific value.

Im basically looping through a associative array and i want to add a key=>value foreach array that has a specific id:

ex:

[0] => Array
    (
        [id] => 1
        [blah] => value2

    )

[1] => Array
    (
        [id] => 1
        [blah] => value2
    )

I want to do it so that while

foreach ($array as $arr) {

     while $arr['id']==$some_id {

            $array['new_key'] .=$some value
            then do a array_push
      }    
}

so $some_value is going to be associated with the specific id.

Tucker · Accepted Answer · 2016-05-06 16:49:10Z

13

The while loop doesn't make sense since keys are unique in an associative array. Also, are you sure you want to modify the array while you are looping through it? That may cause problems. Try this:

$tmp = new array();
foreach ($array as $arr) {

     if($array['id']==$some_id) {
            $tmp['new_key'] = $some_value;
      }    
}


array_merge($array,$tmp);

A more efficient way is this:

if(in_array($some_id,$array){
  $array['new_key'] = $some_value;
}

or if its a key in the array you want to match and not the value...

if(array_key_exists($some_id,$array){
      $array['new_key'] = $some_value;
    }

edited May 6, 2016 at 16:49

answered Jul 12, 2012 at 22:46

Tucker

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1 Comment

Besnik Over a year ago

typo: $arrary, the 'id' key exists only in $arr not in $array, and you missed the semicolon and a underline at "$some value"

Delford Chaffin · Accepted Answer · 2013-06-24 20:59:52Z

7

When you use:

foreach($array as $arr){
    ...
}

... the $arr variable is a local copy that is only scoped to that foreach. Anything you add to it will not affect the $array variable. However, if you call $arr by reference:

foreach($array as &$arr){ // notice the &
    ...
}

... now if you add a new key to that array it will affect the $array through which you are looping.

I hope I understood your question correctly.

answered Jun 24, 2013 at 20:59

Delford Chaffin

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1 Comment

Rem Over a year ago

The & was the saviour

Besnik · Accepted Answer · 2012-07-12 22:46:01Z

0

If i understood you correctly, this will be the solution:

foreach ($array as $arr) {
  if ($arr['id'] == $some_id) {
     $arr[] = $some value;
     // or: $arr['key'] but when 'key' already exists it will be overwritten
  }
}

answered Jul 12, 2012 at 22:46

Besnik

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