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@ 2021-05-03T12:40:16Z

<?php

$array = [];
$lastChar = null;
foreach (str_split('10001101') as $char) {
    if ($char !== $lastChar) {
        unset($ref);
        $array[] = &$ref;
        $ref = $char;
        $lastChar = $char;
    } else {
        $ref .= $char;
    }
}
var_export($array);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
str_split: documentation ( source)

preferences:dark modelive preview

57.71 ms | 402 KiB | 5 Q