Adpone/index.php at main · repastran/Adpone · GitHub

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<?php

/*
 * Funcion para retornar cantidad de letras repetidas en continuidad
 */

function repeatedLetters(string $string):array {

    $groups = [];

    $group = [];

    foreach (str_split($string) as $value) {

        if (isset($group[$value])) {

            $group[$value] += 1;

        }else{

            if (count($group)>0) {

                $groups = addResult($groups, $group);

            }

            $group = [
                $value => 1
            ];

        }

    }

    $groups = addResult($groups, $group);

    return $groups;

}

function addResult(array $groups, array $group): array{

    array_push($groups, [array_key_first($group), reset($group)]);

    return $groups;

}

echo json_encode(repeatedLetters("aaaabbbbbcca"));