<?php
declare(strict_types=1);

function readEnabled(string $json): bool
{
    if (strlen($json) > 65536) {
        throw new InvalidArgumentException('payload_too_large');
    }
    try {
        $settings = json_decode($json, false, 64, JSON_THROW_ON_ERROR);
    } catch (JsonException) {
        throw new InvalidArgumentException('invalid_json');
    }
    if (!$settings instanceof stdClass || !is_bool($settings->enabled ?? null)) {
        throw new InvalidArgumentException('invalid_settings');
    }
    return $settings->enabled;
}

foreach (['{"enabled":false}', '{"enabled":"false"}', 'null', '[]', '{'] as $input) {
    try {
        echo readEnabled($input) ? "enabled\n" : "disabled\n";
    } catch (InvalidArgumentException $error) {
        echo $error->getMessage(), PHP_EOL;
    }
}