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@ 2025-03-18T07:17:42Z

<?php

$string = "ddaabbbccddda";

$most = 0;
$result = [];
foreach (preg_split('/(.)\K(?!\1|$)/', $string) as $set) {
    $length = strlen($set);
    if ($length === $most) {
        $result[] = $set;
    } elseif ($length > $most) {
        $result = [$set];
        $most = $length;
    }
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
preg_split: documentation ( source)

preferences:dark modelive previewkey bindings

53.87 ms | 405 KiB | 5 Q