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@ 2024-10-06T21:43:08Z

<?php

$array = ['45', '21', '45', '45', '45', '29', '35', '35', '21'];

$result = [];
$last = null;
foreach ($array as $v) {
    if ($last !== $v) {
        unset($ref);
        $result[] =& $ref;
    }
    $ref[] = $v;
    $last = $v;
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

30.52 ms | 404 KiB | 5 Q