Seperate an array into 3 different arrays in PHP

Question

I have an array like this:

array(
    '1' => 'Item 1',
    '2' => 'Item 2',
    '3' => 'Item 3',
    '4' => 'Item 4',
    '5' => 'Item 5',
    '6' => 'Item 6',
    '7' => 'Item 7',
    '8' => 'Item 8',
    '9' => 'Item 9'
);

I want to separate this into 3 arrays where keys 1,2,3 go into $array1,$array2,$array3 respectively and then keys 4,5,6 and then 7,8,9 go into $array1,$array2,$array3 respectively too.

So, the final output would be:

$array1 = array(
    '1' => 'Item 1',
    '2' => 'Item 4',
    '3' => 'Item 7'
);

$array2 = array(
    '1' => 'Item 2',
    '2' => 'Item 5',
    '3' => 'Item 8'
);

$array3 = array(
    '1' => 'Item 3',
    '2' => 'Item 6',
    '3' => 'Item 9'
);

Or, if they keys are preserved (and not 1,2,3 in each array as in my example) then that wouldn't matter either. Either way is fine.

Dmitry Seleznev · Accepted Answer · 2013-11-15 07:48:59Z

2

foreach($arr as $key => $value) {
    $final_arr[$key % 3][] = $value;
}

answered Nov 15, 2013 at 7:48

Dmitry Seleznev

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3 Comments

Darkzaelus Over a year ago

Very clean and easy to understand. Only one thing, the key for each array items will be numerical and start at 0, which may be what the poster wants

webnoob Over a year ago

This doesn't actually answer the OP's question, he wants 3 distinct arrays, not one array with a different key for each of the 3 sets.

Joseph Over a year ago

@webnoob is correct, this does not do exactly to the letter what I asked. However, I have marked it as the correct answer because the code is so simple, clean and straightforward and the end result still achieves the goal I set out for which was to separate the data into 3 lists with the first item of each list being the first 3 keys in the original array, the second item in each list being the second 3 keys etc etc.

Alexander · Accepted Answer · 2013-11-15 07:44:53Z

2

Sth like

$i=0;
foreach($array as $k=>$v) {
 ${"array".$i%3+1}[$k]=$v;
 $i++;
}

answered Nov 15, 2013 at 7:44

Alexander

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Comments

Sondre · Accepted Answer · 2013-11-15 08:03:10Z

1

for($i = 0; $i < count($input); $i += 3) {
    ${"array".$i} = array_slice($input, 0 + $i, 3);
}

This will split your array into new array on every third element. You can also replace 3 with a variable to split on some other number.

Edit: oh I just noticed, you might want to offset $i to get the array names in correct order. Now it will be array3, array6, array9 etc

answered Nov 15, 2013 at 8:03

Sondre

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Comments

vishal Sharma · Accepted Answer · 2013-11-15 09:19:03Z

0

   Try This

          $first_arr = array();
                $second_arr = array();
                $third_arr = array();
                $first = 0;
                $second = 1;
                $third = 2;    
                foreach($array as $value)
                {
                    if ($first++ % 3 == 0)
                    $first_arr[] = $value;
                    if ($second++ % 3 == 0)
                    $second_arr[] = $value;
                    if ($third++ % 3 == 0)
                    $third_arr[] = $value;
                }

answered Nov 15, 2013 at 9:19

vishal Sharma

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