PHP表单验证内容是否为空的实现代码

内容为空效果图为：

填写内容效果图：

下面是验证程序的代码：

<!doctype html>
<html>
<head>
<meta http-equiv="conent-type" content="text/html" charset="utf-8"/>
<style>
.red{
color:red;
}
</style>
</head>
<body>
<?php
function test_input($data){
  $data=trim($data);
  $data=stripslashes($data);
  $data=htmlspecialchars($data);
  return $data;
}
?>
<?php
$name=$email=$web=$comment=$gender="";
$nameerr=$emailerr=$weberr=$commenterr=$gendererr="";
if($_SERVER['REQUEST_METHOD']=="POST"){
  if(empty($_POST['name'])){
    $nameerr="必填名字";
  }else{
    $name=test_input($_POST['name']);
  }
  if(empty($_POST['email'])){
    $emailerr="必填邮件";
  }else{
    $email=test_input($_POST['email']);
  }
  if(empty($_POST['web'])){
    $weberr="必填网址";
  }else{
    $web=test_input($_POST['web']);
  }
  if(empty($_POST['comment'])){
    $commenterr="必填备注";
  }else{
    $comment=test_input($_POST['comment']);
  }
  if(empty($_POST['gender'])){
    $gendererr="必填备注";
  }else{
    $gender=test_input($_POST['gender']);
  }
}
?>
<h1>表单验证</h1>
<span class="red">*必填字段</span>
<form method="POST" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
名字：<input type="text" name="name"/><span class="red"><?php echo "*".$nameerr;?></span>
<br/>
E-mail：<input type="text" name="email"/><span class="red"><?php echo "*".$emailerr;?></span>
<br/>
网址：<input type="text" name="web"/><span class="red"><?php echo "*".$weberr;?></span>
<br/>
备注：<textarea rows="10" cols="40" name="comment"></textarea><span class="red"><?php echo "*".$commenterr;?></span>
<br/>
性别：<input type="radio" name="gender" value="男"/>男<input type="radio" name="gender" value="女"/>女<span class="red"><?php echo "*".$gendererr;?></span>
<br/>
<input type="submit" value="提交验证"/>
</form>
<?php
echo "名字".$name;
echo "<br/>";
echo "E-mail：".$email;
echo "<br/>";
echo "网址：".$web;
echo "<br/>";
echo "备注：".$comment;
echo "<br/>";
echo "性别：".$gender;
echo "<br/>";
?>
</body>
</html>

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