Online PHP editor | refs for c2Irh

@ 2021-10-05T09:23:23Z

<?php

$input = [1, 1, 1, 2, 2, 2, 1, 1, 2, 2, 1];

$output = [];
$idx = -1;
$prev = null;
foreach($input as $val) {
    if($prev !== $val) {
        ++$idx;
    }
    $output[$idx][] = $val;
    $prev = $val;
}

print_r($output);