php split array into smaller even arrays

by

EDIT: There’s array_chunk, which does just that.

Well, I didn’t feel like debugging, so I wrote a version with array_reduce:

$pergroup = 2;
$redfunc = function ($partial, $elem) use ($pergroup) {
    $groupCount = count($partial);
    if ($groupCount == 0 || count(end($partial)) == $pergroup)
        $partial[] = array($elem);
    else
        $partial[$groupCount-1][] = $elem;

    return $partial;
};

$arr = array(1,2,3,4,5);

print_r(array_reduce($arr, $redfunc, array()));

gives

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 2
        )

    [1] => Array
        (
            [0] => 3
            [1] => 4
        )

    [2] => Array
        (
            [0] => 5
        )

)

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