Create 2-element rows from flat array where the every second row value is also the first value of the next row

Question

$arrayinput = array("a", "b", "c", "d", "e");

How can I achieve the following output....

output:

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

[1] => Array
    (
        [0] => b
        [1] => c
    )

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

[3] => Array
    (
        [0] => d
        [1] => e
    )

[4] => Array
    (
        [0] => e
    )

)

Answer 1

You can use this, live demo here.

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

$array = [];
foreach($arrayinput as $v)
{
  $arr = [];
  $arr[] = $v;
  if($next = next($arrayinput))
    $arr[] = $next;
  $array[] = $arr;
}
print_r($array);