How to merge two arrays within a variable?

Question

I have an array of two arrays that I am trying to merge into one array. My arrays are in a variable $arr, var_dump of which looks like this:

array (size=2)
  0 => 
    array (size=1)
      0 => string 'onetag' (length=6)
  1 => 
    array (size=1)
      0 => string 'anothertag' (length=10)

Applying $marr = array_merge($arr) doesn't appear to do anything. I am trying to get the merged array to look like this ['onetag', 'anothertag'], or upon var_dump like this:

array (size=2)
  0 => string 'onetag' (length=6)
  1 => string 'anothertag' (length=10)

[how-to-flatten-a-multidimensional-array](http://stackoverflow.com/questions/1319903/how-to-flatten-a-multidimensional-array) — cske, May 12 '16 at 09:01

score 1 · Answer 1 · answered May 12 '16 at 08:14

1

Try:

$marr = array_merge($arr[0],$arr[1]);

answered May 12 '16 at 08:14

Noman Ghani

468
3
9

Thanks, that works, but what if I do not know exactly how many arrays are in the `$arr` array? There can be from 1 to 10 or 20 arrays. I just used two as an example. How can I set it up then? – Arthur Tarasov May 12 '16 at 08:19
Just wrap it in a foreach loop and merge them consecutively. – Emanuel Oster May 12 '16 at 08:22

score 1 · Accepted Answer · answered May 12 '16 at 08:18

1

Use below code

$arr = array_column($arr,0);
var_dump($arr);

OUTPUT :

array (size=2)
  0 => string 'onetag' (length=6)
  1 => string 'anothertag' (length=10)

answered May 12 '16 at 08:18

Brijal Savaliya

1,101
9
19

if its working for you then please accept this answer @Arthur Tarasov – Brijal Savaliya May 12 '16 at 08:25
Got it, I had to wait for 5 minutes :) – Arthur Tarasov May 12 '16 at 08:30

score 1 · Answer 3 · answered May 12 '16 at 08:22

array_merge takes at least two arrays as arguments and merge them into one. You are passing only one and no second to merge the first with. You want to create a single array with all the element of $arr[0] and $arr[1]. So you have tomerge $arr[0] and $arr[1] like so: array_merge($arr[0],$arr[1]);

And here is simple foreach loop:

$marr = array();
foreach ($arr as $key => $value) {
    $marr = array_merge($marr, $arr[$key]);
}

How to merge two arrays within a variable?

3 Answers3