S2OJ/web/app/controllers/add_contest.php

<?php
requirePHPLib('form');

Auth::check() || redirectToLogin();
UOJContest::userCanCreateContest(Auth::user()) || UOJResponse::page403();

$time_form = new UOJForm('time');
$time_form->addInput(
	'name',
	[
		'label' => '比赛标题',
		'default_value' => 'New Contest',
		'validator_php' => function ($name, &$vdata) {
			if ($name == '') {
				return '标题不能为空';
			}

			if (strlen($name) > 100) {
				return '标题过长';
			}

			$name = HTML::escape($name);

			if ($name === '') {
				return '无效编码';
			}

			$vdata['name'] = $name;

			return '';
		},
	]
);
$time_form->addInput(
	'start_time',
	[
		'div_class' => 'mt-2',
		'label' => '开始时间',
		'default_value' => date("Y-m-d H:i:s"),
		'validator_php' => function ($str, &$vdata) {
			try {
				$vdata['start_time'] = new DateTime($str);
			} catch (Exception $e) {
				return '无效时间格式';
			}

			return '';
		},
	]
);
$time_form->addInput(
	'last_min',
	[
		'div_class' => 'mt-2',
		'label' => '时长（单位：分钟）',
		'default_value' => '180',
		'validator_php' => function ($str, &$vdata) {
			if (!validateUInt($str)) {
				return '必须为一个整数';
			}

			$vdata['last_min'] = $str;

			return '';
		},
	]
);
$time_form->handle = function (&$vdata) {
	$start_time_str = $vdata['start_time']->format('Y-m-d H:i:s');

	DB::insert([
		"insert into contests",
		"(name, start_time, last_min, status)", "values",
		DB::tuple([$vdata['name'], $start_time_str, $vdata['last_min'], 'unfinished'])
	]);
};
$time_form->succ_href = "/contests";
$time_form->runAtServer();
?>

<?php echoUOJPageHeader(UOJLocale::get('contests::add new contest')) ?>

<div class="row">
	<!-- left col -->
	<div class="col-lg-9">
		<div class="card card-default mb-2">
			<div class="card-body">
				<h1 class="card-title">
					<?= UOJLocale::get('contests::add new contest') ?>
				</h1>

				<div class="w-full" style="max-width: 400px">
					<?php $time_form->printHTML() ?>
				</div>
			</div>
		</div>
	</div>
	<!-- end left col -->

	<!-- right col -->
	<aside class="col-lg-3 mt-3 mt-lg-0">
		<?php uojIncludeView('sidebar') ?>
	</aside>
	<!-- end right col -->
</div>

<?php echoUOJPageFooter() ?>