Split Multidimensional Array into Smaller Arrays

Question

I have a multidimensional array that looks like this:

{
  "groups": [
    {
      "__v": 0,
      "_create_date": "2014-08-20T23:00:12.901Z",
      "_id": "53f5287ca78473a969001827",
      "_last_message_date": "2014-08-20T23:04:36.347Z",
      "activity": 0,
      "blocked_users": [],
      "created_by": {
        "_id": "53e84b0eba84943c6d0003f8",
        "_last_modified": "2014-08-20T00:11:05.399Z",
        "first_name": "Jegg",
        "last_name": "V"
      },
      "curated": false,
      "diversity": 0,
      "featured": false,
      "flagged": false,
      "last_message": {
        "text": "let's talk beo",
        "created_by": {
          "_id": "53e84b0eba84943c6d0003f8",
          "first_name": "Jegg",
          "last_name": "V"
        },
        "_id": "53f52984a78473a969001833",
        "_create_date": "2014-08-20T23:04:36.347Z"
      },
      "member_count": 1,
      "messages_count": 1,
      "name": "Test",
      "public": true,
      "recency": 52182276.347,
      "score": 52182276.347,
      "tags": []
    },

This structure repeats over 3000 times creating a very large multidimensional array. I think I can use array_chunk($array, 300) to break the array into smaller chunks. But I can't figure out how to access them exactly.

What I want to do is independently loop through the newly chunked arrays. So I'd like to end up with something like:

$array1 = {...}
$array2 = {...}
$array3 = {...}
$array4 = {...}

... and so on

THen I could loop through each of the newly created arrays, which are essentially smaller groups of the original array, but of 3000 arrays in one multidimensional array as I have in the first place, I end up with these smaller ones of 300 arrays each.

I hope this makes sense, I'm kinda out of my league. Help is always appreciated.

What is it you're hoping to gain by splitting the array up like that? I have to imagine a structure like this * 3000 plus 300 individual arrays would use a non-inconsequential amount of memory. — Jeff Lambert
– Jeff Lambert, Commented Aug 21, 2014 at 6:14
you can access the result array like $resultarray[0],$resultarray[1] ..... $resultarray[n] where each $resultarray[] with 300 items — bansi
– bansi, Commented Aug 21, 2014 at 6:15
Yes, it's a JSON response decoded. I actually am not planning on running this on an active site, it's to be run on schedule to generate an HTML sitemap with the data in the JSON object. But I can't write more than 300 records per page for SEO reasons, so i need to create many different pages. My thought (which might be lame) is to loop through each new array and write out a separate HTML file for each limited to 300 per page. @bansi that might work, how could I get a count of how many chunks were created? — Jeff Solomon
– Jeff Solomon, Commented Aug 21, 2014 at 6:23

Bhavik Shah · Accepted Answer · 2014-08-21 07:12:35Z

1

I think your array is in json format.

First decode it and then pass to array_chunk method.

array_chunk($input_array, 300));

then access them as $input_array[0][0], $input_array[0][1]....... $input_array[0][299], $input_array[1][0], $input_array[1][1].....

edited Aug 21, 2014 at 7:12

Bhavik Shah

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answered Aug 21, 2014 at 6:23

Suchit kumar

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ojrask · Accepted Answer · 2014-08-21 07:23:40Z

EDIT: oh, somehow I entirely misread the question. array_chunk is something worth looking into.

You could try using extract to fetch array values to the "global" variable namespace.

extract takes three arguments: the array you wish to extract, flags, and prefix if needed.

I'm not sure how non-associative arrays are extracted, but you could try

$full_array = array(
    array( ... ),
    array( ... ),
    array( ... ),
    array( ... ),
    ...
);

// EXTR_PREFIX_ALL prefixes all extracted keys with wanted prefix (the third param).
$extract_amount = extract( $full_array, EXTR_PREFIX_ALL, 'prefix' );

Now you should have the array extracted and available for use with variable names $prefix0, $prefix1, $prefix2 and so on.

I'm not sure how smart it is to extract an array with hundreds of available values.

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