0

I was wondering if it was possible to merge two arrays and then override the property of the original array.

$originalArray = [1,2,3];
$newArray = [
         'first'  => array_merge($originalArray, [4,5]),
         'second' => array_merge($originalArray, [6,7]),
];

So what I want to achieve is $originalArray would be [1,2,3], then $newArray['first'] would be [1,2,3,4,5] and then $newArray['second'] would be [1,2,3,4,5,6,7]

Right now, what I have is $originalArray is [1,2,3], then $newArray['first'] is [1,2,3,4,5] and then $newArray['second'] is [1,2,3,6,7] and that makes perfect sense as $originalArray is being merged on both first and second instance but $originalArray is not being overwritten.

I was wondering if that is possible at all? Can we intermediately override the values of $originalArray within $newArray?

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3
  • why don't you perform array_merge before assigning it into $newArray? Commented Jan 16, 2020 at 5:38
  • @AnkitSingh the code above is just an excerpt of what I am working on. So ideally, I dont know if thats possible, but I was thinking if it was possible to do it within $newArray itself. Commented Jan 16, 2020 at 5:39
  • you want your originalArray values to be same with newArray at the end right ? Commented Jan 16, 2020 at 5:47

5 Answers 5

Reset to default
4

Use additional variables to hold the accumulated mergers.

$originalArray = [1,2,3];

$newArray = [
    'first' => ($tempArray = array_merge($originalArray, [4,5])),
    'second' => ($tempArray = array_merge($tempArray, [6,7])),
    'third' => ($tempArray = array_merge($tempArray, [8,9])),
    ...
];
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6 Comments

Thanks for your reply. I was wondering if it is possible to override the value from within the array itself
Why is that important? Isn't the result what matters?
Yes, but the code logic that I have is much complex, and I will have to create multiple intermediate variables which I want to avoid.
I've updated the answer to show how to put the variable assignment inside the array.
If you have lots of them, it might be easier to write a function that uses a loop.
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3

Merge as you go with a loop, and update your original array with the last merge.

<?php

$orig  = [1,2,3];
$trans = [
         'first'  => [4,5],
         'second' => [6,7],
];

foreach($trans as &$v) {
    $orig = $v = array_merge($orig, $v);
}
unset($v);

var_export($trans);

Output:

array (
  'first' => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
    3 => 4,
    4 => 5,
  ),
  'second' => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
    3 => 4,
    4 => 5,
    5 => 6,
    6 => 7,
  ),
)
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1 Comment

This answer seems the most elegant and direct to me. This is what I'd use in a professional script. It is the least verbose answer which dynamically accumulates data with each iteration.
2

Here is what you want to do:

$originalArray = [1,2,3];
$newArray = [
         'first'  => array_merge($originalArray, [4,5]),
         'second' => array_merge($originalArray, [6,7]),
];


function val($newArray) { return $newArray; }
$originalArray = array_map( 'val' , $newArray);
print_r( $originalArray );

Output: 

Array ( 
[first] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) 
[second] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 6 [4] => 7 ) 
)
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1 Comment

This unexplained answer does not provide the desired result. This provides the same result as the asker's code.
1

below will help

$originalArray = [1,2,3];


$firstArr = ['first'=> array_merge($originalArray, [4,5])];
$secArr = ['second'=> array_merge($firstArr['first'], [6,7])];
print_r($secArr);
//OR
$newArray = [
         'first'  => array_merge($originalArray, [4,5]),
         'second' => array_merge(array_merge($originalArray,[4,5]), [6,7]),
];
print_r($newArray['second']);
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1 Comment

This hardcoded approach is not helpful for the task. The whole point is to dynamically accumulate values as you iterate.
1

Try the below code. It's working for you.

<?php
$originalArray = [1,2,3];

$newArray['first'] = array_merge($originalArray, [4,5]);
$newArray['second'] = array_merge($newArray['first'], [6,7]);
$newArray['third'] = array_merge($newArray['second'], [8,9]);

echo "<pre>";
print_r($newArray);
?>

=> Output

Array
(
    [first] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
            [4] => 5
        )

    [second] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
            [4] => 5
            [5] => 6
            [6] => 7
        )

    [third] => Array
        (
            [0] => 1
            [1] => 2
            [2] => 3
            [3] => 4
            [4] => 5
            [5] => 6
            [6] => 7
            [7] => 8
            [8] => 9
        )

)
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