PHP: Split an array into diffrent size chunks based on values from another array

Question

Is there a neat way to split array into chunks based on length from another array?

$start = range(0,30);
$length = array(3,7,2,12,6);

$target = array([0]=>array(0,1,2),
                [1]=>array(4,5,6,7,8,9,10),
                [2]=>array(11,12),
                [3]=>array(13,14,15,16,17,18,19,20,21,22,23,24),
                [4]=>array(25,26,27,28,29,30));

Answer 1

Using array_splice :

$target = array(); // or use []  in PHP 5.4
foreach($length as $i) {
    $target[] = array_splice($start, 0, $i);
}

Try it.

Be advised, this changes $start !

Answer 2

This is very easily accomplished with the following:

Code:

$target = array();
$offset = 0;

foreach ($length as $lengthValue) {
    $target[] = array_slice($start, $offset, $lengthValue);
    $offset += $lengthValue;
}
var_dump($target);

Explanation:

What you are doing here is using the array_slice() method (very similar to the substr ) to extract the portion of the array and then inserting it into the target array. Incrementing the offset each time allows the function to remember which one to use next time.

Answer 3

I think the The array_chunk() function may do it. Here is more info about it http://php.net/manual/en/function.array-chunk.php