Splitting one Array into many Array in PHP

Question

I'm in need of splitting of the single array into multiple array for some report generating purpose.

I have an array like this which I have given below.

Array
(
    [blah_1] => 1
    [blahblah_1] => 31
    [blahblahblah_1] => 25
    [blah_3] => 1
    [blahblah_3] => 3
    [blahblahblah_3] => 5
    [blah_10] => 1
    [blahblah_10] => 10
    [blahblahblah_10] => 2
)

I want to split the above to,

Array
(
    [blah_1] => 1
    [blahblah_1] => 31
    [blahblahblah_1] => 25
)

Array
(
    [blah_3] => 1
    [blahblah_3] => 3
    [blahblahblah_3] => 5
)

Array
(
    [blah_10] => 1
    [blahblah_10] => 10
    [blahblahblah_10] => 2
)

How can I do this in PHP ??

have you tried array_chunk? php.net/manual/en/function.array-chunk.php — sofl
– sofl, Commented May 29, 2012 at 12:09
Do all of the keys for each group always exist, or are the number of keys per group dynamic and determined only by the _n on the end? — Michael Berkowski
– Michael Berkowski, Commented May 29, 2012 at 12:13
Ya the groups are dynamic, sometimes it comes & sometimes it doesn't. I tried, Array_chunk & array_slice, both doesn't satisfy my need. This is purely determined by _n. — Praveen Kumar
– Praveen Kumar, Commented May 29, 2012 at 12:18
Added a downvote , because you didn't add an exact information in the question, that you would like to group by "_n" . If you don't tell me what you exactly need, we can't figure it out. — tildy
– tildy, Commented May 30, 2012 at 15:50

Death · Accepted Answer · 2012-05-29 12:52:59Z

2

$oldarray=array('blah_1'=>1,'blahblah_1'=>31,'blahblahblah_1'=>25,
'blah_3'=>1,'blahblah_3'=>3,'blahblahblah_3'=>5,
'blah_10'=>1,'blahblah_10'=>10,'blahblahblah_10'=>2
)
$newarray=array();

foreach ($oldarray as $key=>$val) { //Loops through each element in your original array

    $parts=array_reverse(explode('_',$key)); //Splits the key around _ and reverses
    $newarray[$parts[0]][$key]=$val; //Gets the first part (the number) and adds the
    //value to a new array based on this number.

}

The output will be:

Array (
    [1]=>Array
    (
        [blah_1] => 1
        [blahblah_1] => 31
        [blahblahblah_1] => 25
    )

    [3]=>Array
    (
        [blah_3] => 1
        [blahblah_3] => 3
        [blahblahblah_3] => 5
    )

    [10]=>Array
    (
        [blah_10] => 1
        [blahblah_10] => 10
        [blahblahblah_10] => 2
    )
)

edited May 29, 2012 at 12:52

answered May 29, 2012 at 12:15

Death

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4 Comments

Praveen Kumar Over a year ago

I got the array like this, ``

Death Over a year ago

I just fixed a few mismatched variables in the code I wrote - the reply box isn't great for formatting :L Should work fine now.

Praveen Kumar Over a year ago

I got the array like what you have shown, but how do I get how I have shown above? or is there anyway that I can use it in while loop ? coz now the page loads, doesn't stops, I think infinite loop.

Death Over a year ago

The only reason an infinite loop would be occuring is if the $oldarray value was being written to as the loop happened.

Ignas · Accepted Answer · 2012-05-29 12:10:25Z

0

Use array_chunk. Example:

<?php
   $chunks = array_chunk($yourarray, 3);
   print_r($chunks);
?>

answered May 29, 2012 at 12:10

Ignas

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2 Comments

Michael Berkowski Over a year ago

Will work if the keys are always grouped in the same quantities. Fails if, for example [blahblah_3] doesn't exist

Ignas Over a year ago

He didn't mention that the keys must be grouped though.

Ruben Nagoga · Accepted Answer · 2012-05-29 12:12:00Z

0

Use array_chunk

i.e

$a = array(1,2,3,4,5,6,7);
var_dump(array_chunk($a, 3));

answered May 29, 2012 at 12:12

Ruben Nagoga

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Comments

Macsen Liviu · Accepted Answer · 2012-05-29 12:12:22Z

0

Not sure if you are looking for array_slice

but take a look at this example:

    <?php
        $input = array("a", "b", "c", "d", "e");


       print_r(array_slice($input, 2, -1));
       print_r(array_slice($input, 2, -1, true));
?>

will result in this:

Array
(
    [0] => c
    [1] => d
)
Array
(
    [2] => c
    [3] => d
)

answered May 29, 2012 at 12:12

Macsen Liviu

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Comments

tildy · Accepted Answer · 2012-05-29 12:10:52Z

-1

array_chunk ( array $input , int $size);

answered May 29, 2012 at 12:10

tildy

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1 Comment

tildy Over a year ago

I can create a whole sentence for this response, I didn't feel it's necessary.

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