use FormGuide\PHPFormValidator\FormValidator;

$validator = FormValidator::create();

$validator->fields(['name','email'])->areRequired()->maxLength(50);
$validator->field('email')->isEmail();

if(!$validator->test($_POST))
{
	return json_encode($validator->getErrors(true));
}

使用composer安装

composer require FormGuide/PHPFormValidator

声明单个字段的验证

$validator->field('email')->isEmail()->isRequired();

声明多个字段的验证

$validator->fields(['name','email'])->areRequired()->maxLength(50);

这相当于

$validator->field('name')->isRequired()->maxLength(50);

$validator->field('email')->isRequired()->maxLength(50);