Similar to str_split() for strings, this function splits up an array into a multidimensional array.

The result is a multidimensional array with each element containing a number of elements of your original array. By default, the original keys will be lost. Set the third parameter to true and the keys will be preserved.

$arr = array( 'z' => 'apple',
              'y' => 'banana',
              'x' => 'carrot',
              'w' => 'durian',
              'v' => 'eggplant',
              'u' => 'fennel',
              't' => 'grapefruit',
              's' => 'honeydew',
              'r' => 'iceburg lettuce',
              'q' => 'jackfruit',
              'p' => 'kale' );
 
$new1 = array_chunk( $arr, 2 );
/*
 array (
  0 =>
  array (
    0 => 'apple',
    1 => 'banana',
  ),
  1 =>
  array (
    0 => 'carrot',
    1 => 'durian',
  ),
  2 =>
  array (
    0 => 'eggplant',
    1 => 'fennel',
  ),
  3 =>
  array (
    0 => 'grapefruit',
    1 => 'honeydew',
  ),
  4 =>
  array (
    0 => 'iceburg lettuce',
    1 => 'jackfruit',
  ),
  5 =>
  array (
    0 => 'kale',
  )
)
*/
 
$new2 = array_chunk( $arr, 2, true );
/*
array (
  0 => 
  array (
    'z' => 'apple',
    'y' => 'banana',
  ),
  1 => 
  array (
    'x' => 'carrot',
    'w' => 'durian',
  ),
  2 => 
  array (
    'v' => 'eggplant',
    'u' => 'fennel',
  ),
  3 => 
  array (
    't' => 'grapefruit',
    's' => 'honeydew',
  ),
  4 => 
  array (
    'r' => 'iceburg lettuce',
    'q' => 'jackfruit',
  ),
  5 => 
  array (
    'p' => 'kale',
  )
)
*/
See the manual entry for array_chunk()