getValueFromArrayByKeys & setValueToArrayByKeys

<?php

protected function getValueFromArrayByKeys(array $values, array $keys, $default = null)
{
    if (count($keys) == 0) {
        return $default;
    }

    foreach ($keys as $key) {
        if (!isset($values[$key])) {
            return $default;
        }
        $values = $values[$key];
    }

    return $values;
}

protected function setValueToArrayByKeys($value, array &$values, array $keys)
{
    if (count($keys) == 0) {
        return;
    }

    $lastKey = array_pop($keys);
    $valuesCurrent = &$values;

    foreach ($keys as $key) {
        if (!isset($valuesCurrent[$key])) {
            $valuesCurrent[$key] = [];
        }
        $valuesCurrent = &$valuesCurrent[$key];
    }

    $valuesCurrent[$lastKey] = $value;

    return $values;
}