如何解决PHP数据验证的复杂性问题？使用Rakit/Validation库可以！

";
    print_r($errors->firstOfAll());
    echo "

<code class="php">$validator = new Validator;

$validation = $validator->make([
    'province_id' => $_POST['province_id'],
    'district_id' => $_POST['district_id']
], [
    'province_id' => 'required|numeric',
    'district_id' => 'required|numeric'
]);

$validation->setAlias('province_id', 'Province');
$validation->setAlias('district_id', 'District');

// 或者
$validation->setAliases([
    'province_id' => 'Province',
    'district_id' => 'District'
]);

$validation->validate();</code>

<code class="php">$validator = new Validator([
    'required' => ':attribute harus diisi',
    'email' => ':email tidak valid',
]);

// 或者使用 `setMessages` 方法
$validator->setMessages([
    'required' => ':attribute harus diisi',
    'email' => ':email tidak valid',
]);</code>

<code class="php">$validation = $validator->validate($inputs, $rules);

$errors = $validation->errors();

$messages = $errors->all();
$messages = $errors->firstOfAll();
$message = $errors->first('email');
$messages = $errors->toArray();
$count = $errors->count();
$hasError = $errors->has('email');</code>

<code class="php">$validatedData = $validation->getValidatedData();
$validData = $validation->getValidData();
$invalidData = $validation->getInvalidData();</code>

<code class="php">class UniqueRule extends Rule
{
    protected $message = ":attribute :value has been used";

    protected $fillableParams = ['table', 'column', 'except'];

    protected $pdo;

    public function __construct(PDO $pdo)
    {
        $this->pdo = $pdo;
    }

    public function check($value): bool
    {
        $this->requireParameters(['table', 'column']);

        $column = $this->parameter('column');
        $table = $this->parameter('table');
        $except = $this->parameter('except');

        if ($except AND $except == $value) {
            return true;
        }

        $stmt = $this->pdo->prepare("select count(*) as count from `{$table}` where `{$column}` = :value");
        $stmt->bindParam(':value', $value);
        $stmt->execute();
        $data = $stmt->fetch(PDO::FETCH_ASSOC);

        return intval($data['count']) === 0;
    }
}

$validator = new Validator;
$validator->addValidator('unique', new UniqueRule($pdo));

$validation = $validator->validate($_POST, [
    'email' => 'email|unique:users,email,exception@mail.com'
]);</code>