Helper para o vlucas/valitron

validator.php

<?php

function validate(array $data, array $rules)
{
    $v = new Valitron\Validator($data);

    foreach ($rules as $rule => $fields) {

        $optional = null;

        $rule = explode('=', $rule);
        if (count($rule) > 1) {
            $optional = $rule[1];
        }
        $rule = $rule[0];

        if ($optional !== null) {
            $v->rule($rule, $fields, $optional);
            continue;
        }

        $v->rule($rule, $fields);
    }

    if (!$v->validate()) {
        return $v->errors();
    }

    return true;
}