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@ 2018-11-14T12:28:08Z

<?php
$array = [
    1 => 'world',
    2 => 'is',
    3 => 'a',
    4 => 'wonderfull',
    6 => 'in',
    8 => 'our'
];

$prev = -1;
$i = 0;
foreach ($array as $key => $val) {
    if (++$prev && $key - $prev) {
        ++$i;
    }
    $result[$i][] = $val;
    $prev = $key;
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

25.19 ms | 404 KiB | 5 Q