PHP - how to update values in the multiple dimensional array

Question

I created multiple dimensional array and tried to update count value for certain condition as below but not working.

$test[] = [
           'firstNm' => 'luke'
           ,'lastNm' => 'Lee'
           ,'count' => 10

         ];

$test[] = [
           'firstNm' => 'John'
           ,'lastNm' => 'Doe'
           ,'count' => 20
          ];

    foreach ($test as $test01)
    {
     if ($test01['firstNm'] === 'John'){
      $test01['count'] += 70 ;}
    }

Looking forward to your help. Thank you.

Not one of your questions you have marked as answered...one day people will stop answering your questions. — Rasclatt, Jan 03 '17 at 03:55
Possible duplicate of [PHP - Modify current object in foreach loop](http://stackoverflow.com/questions/10121483/php-modify-current-object-in-foreach-loop) — Sᴀᴍ Onᴇᴌᴀ, Jan 03 '17 at 04:28

score 1 · Answer 1 · answered Jan 03 '17 at 03:59

1

Actually you are increasing the value but missing to reasign to the same array. Try this one.

   $test[] = [
           'firstNm' => 'luke'
           ,'lastNm' => 'Lee'
           ,'count' => 10

         ];

$test[] = [
           'firstNm' => 'John'
           ,'lastNm' => 'Doe'
           ,'count' => 20
          ];

    foreach ($test as $key => $test01)
    { 
     if ($test01['firstNm'] === 'John'){
       $test[$key]['count'] += 70 ;
      }
    }

print_r($test);

answered Jan 03 '17 at 03:59

Naga

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@LukeLee Please accept and upvote if this answer help you to solve your problem. – Naga Jan 03 '17 at 04:09
I'm going to upvote it, as @LukeLee is not accepting your answer. – Nakul Jan 03 '17 at 06:01

score 0 · Answer 2 · edited May 23 '17 at 10:29

Borrowing from this answer, which cites the PHP manual page for foreach:

In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.¹

So you could iterate over the array elements by-reference:

foreach ($test as &$test01)
{
    if ($test01['firstNm'] === 'John'){
        $test01['count'] += 70 ;
    }
}

See this illustrated on Teh Playground.

Otherwise you can iterate using the key=>value syntax:

foreach ($test as $index=>$test01)
{
     if ($test01['firstNm'] === 'John'){
         $test[$index]['count'] += 70 ;
     }
}

PHP - how to update values in the multiple dimensional array

2 Answers2