Merge two dimensional array in PHP

Question

for a long time can't resolve smth looking like as very simple matter... I want merge a two dimensional arrays. The example:

$arr1 = {
  [532] =
  {
    [0] = "11"
    [1] = "12"
  }
  [273] =
  {
    [0] = "99"
  }
}
$arr2 = {
  [532] =
  {
    [0] = "11"
    [1] = "13"
  }
}

And the result of merging should be, a map on common keys, exactly like that array:

$result = {
  [532] =
  {
     [0] =
     {      
        [0] = "11"
        [1] = "12"
     }
     [1] =
     {
        [0] = "11"
        [1] = "13"
     }
  }
  [273]
     [0] =
     {      
        [0] = "99"
     }
     [1] =
     {

     }
}

I try sometihng like that:

    $result = $arr1;
    foreach ($arr2 as $key => $value) {
        $result[$key] = isset($result[$key]) ? array_merge([$result[$key]], [$value]) : [$value];
    }

But it doesnt work if $arr2 is empty :(

What do you mean by if $arr2 is empty. Why to merge if you don't have second array ? — jitendrapurohit
– jitendrapurohit, Commented Sep 21, 2016 at 9:08

devpro · Accepted Answer · 2016-09-21 09:12:07Z

For the second array checking, you need to use isset() either array set or not:

Example:

<?php
$arr1 = array('532'=>array('11','12'),'273'=>array('99'));
$arr2 = array('532'=>array('11','13'));

$newArr = array();
foreach ($arr1 as $key => $value) {
   if(isset($arr2[$key])){
      $newArr[$key][] = $value;
      $newArr[$key][] = $arr2[$key];
   }
   else{
      $newArr[$key] = $value;
   }
}
echo "<pre>";
print_r($newArr);
?>

Result:

Array
(
    [532] => Array
        (
            [0] => Array
                (
                    [0] => 11
                    [1] => 12
                )

            [1] => Array
                (
                    [0] => 11
                    [1] => 13
                )

        )

    [273] => Array
        (
            [0] => 99
        )

)

Further more, if you want to merge both same index than you can use array_merge() some thing like that:

<?php
$arr1 = array('532'=>array('11','12'),'273'=>array('99'));
$arr2 = array('532'=>array('11','13'));

$newArr = array();
foreach ($arr1 as $key => $value) {
   if(isset($arr2[$key])){
      $newArr[$key][] = array_merge($value,$arr2[$key]);      
   }
   else{
      $newArr[$key] = $value;
   }
}
echo "<pre>";
print_r($newArr);
?>

Result:

Array
(
    [532] => Array
        (
            [0] => Array
                (
                    [0] => 11
                    [1] => 12
                    [2] => 11
                    [3] => 13
                )

        )

    [273] => Array
        (
            [0] => 99
        )

)

Note that, ist script, will give you result as you need with unique index. Second script will give you all values in one single array.

Richard Housham · Accepted Answer · 2016-09-21 09:46:41Z

1

Probably something like this

 $arr1 = {
      [532] =
      {
        [0] = "11"
        [1] = "12"
      }
      [273] =
      {
        [0] = "99"
      }
    }
    $arr2 = {
      [532] =
      {
        [0] = "11"
        [1] = "13"
      }
    }

   $newarray = array();
   foreach ($arr1 as $key => $value) {
      $cu = $arr1[$key];

      $newarray[$key][] = $cu;

      if(!isset($arr2[$key])) {
            $newarray[$key][] = array();
       }
       else {
         $newarray[$key][] = $arr2[$key];
       }
   }

foreach ($arr2 as $key => $value) {
          if(!isset($newarray[$key])) {
             $newarray[$key][] = $arr2[$key]; 
          }
       }

edited Sep 21, 2016 at 9:46

answered Sep 21, 2016 at 9:05

Richard Housham

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6 Comments

Richard Housham Over a year ago

Arg, your right - think I've got it now - bit tricky without the f5 button!

Richard Housham Over a year ago

See where your going with it - ok

Elly Kedward Over a year ago

Ok, but what if the first array will be empty? I always want to get array with structure like in the example

Richard Housham Over a year ago

Then do another foreach loop to stick in any of the ones missing.

Elly Kedward Over a year ago

I mean.. Arrays may look the other way around

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