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<!DOCTYPE html><html>
<head>
<title>粘性表单</title>
<link rel="stylesheet" href="dist/css/bootstrap.css">
<script src=" https://code.jquery.com/jquery-3.2.1.min.js">
</script><script src="dist/js/bootstrap.js"></script>
</head>
<body>
<form action='' method="post"> //建立表单
<p>
<label>用户名:
<input type="text" name="user_name" value=<?php echo (isset ($_POST['user_name']))?$_POST['user_name']:''?>>
</label>
</p>
<p>
<label>密 码:
<input type="password" name="password" value=<?php echo (isset($_POST['password']))?$_POST['password']:''?>>
</label>
</p>
<p>
<label>邮 箱:
<input type="email" name="e_mail" value=<?php echo (isset($_POST['e_mail']))?$_POST['e_mail']:''?>>
</label>
</p>
<label>性 别:<input type="radio" name="gender" value='male'<?php echo (isset($_POST['gender']) && $_POST['gender']=='male')?'checked':''?>>男 <input type="radio" name="gender" value="woman"<?php echo (isset($_POST['gender']) && $_POST['gender']=='woman')?'checked':''?>>女
</label>
<select name="degree">
<h5>学历</h5>
<option>请选择</option>
<option value="bk"<?php echo (isset($_POST['degree']) && $_POST['degree']=='bk')?'selected':''?>>本科</option>
<option value="yjs"<?php echo (isset($_POST['degree']) && $_POST['degree']=='yjs')?'selected':''?>>研究生</option>
<option value="bs"<?php echo (isset($_POST['degree']) && $_POST['degree']=='bs')?'selected':''?>>博士</option>
</select>
<input type="submit" value="提交">
</form>
</body>
</html>
/*下面一段PHP代码进行验证
<?php
if($_SERVER['REQUEST_METHOD']){ /*判断是否是post方式提交过来的数据
$name=isset($_POST['user_name'])?$_POST['user_name']:null;
/*用户名验证，不能为空，不能少于六位大于十位
if(empty($name)){
echo '<script>alert("请输入用户名")</script>';
exit;
}elseif(strlen($name)<6){
echo '<script>alert("用户名不能少于六位")</script>';
exit;
}elseif(strlen($name)>10){
echo '<script>alert("用户名不能大于十位")</script>';
exit;
}else{
echo $name.'<br>';
}
/*密码验证：密码不能少于六位不能大于十位不能为空
$pass=isset($_POST['password'])?$_POST['password']:null;
if(empty($pass)){
echo '<script>alert("密码不能为空")</script>';
exit;
}elseif(strlen($pass)<6){
echo '<script>alert("密码不能小于六位")</script>';
exit;
}elseif(strlen($pass)>10){
echo '<script>alert("密码不能大于十位")</script>';
exit;
}else{
echo $pass.'<br>';
}
//邮箱验证：邮箱格式必须正确，邮箱不能为空
$email=isset($_POST['e_mail'])?$_POST['e_mail']:null;
if(empty($email)){
echo '<script>alert("电子邮件不能为空")</script>';
}elseif(!preg_match("/[\w\-]+\@[\w\-]+\.[\w\-]+/",$email)){
echo '<script>alert("电子邮件不合法")</script>';
}else{
echo $email.'<br>';
}
//单选按钮性别验证
$gender=isset($_POST['gender'])?$_POST['gender']:null;
if(empty($gender)){
echo '<script>alert("请选择性别")</script>';
}elseif($gender=='male'){
echo '性别是男</br>';
}elseif($gender=='woman'){
echo '性别是女<br>';
}
/*下拉框学历验证
$degre=isset($_POST['degree'])?$_POST['degree']:null;
if(empty($degre)){
echo '<script>alert("请选择学历")</script>';
}elseif($degre=='bk'){
echo '学历是本科<br>';
}elseif($degre=='yjs'){
echo '学历是研究生<br>';
}elseif($degre=='bs'){
echo '学历是博士<br>';
}
echo '<script>confirm("确认提交吗?");</script>';
echo $name.'<br>'; echo $pass.'<br>'; echo $email.'<br>'; echo $gender.'<br>'; echo $degre.'<br>';
}?> 
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