PHP表单验证内容是否为空的实现代码

时间:2021-07-31 03:00:02

内容为空效果图为:

PHP表单验证内容是否为空的实现代码

填写内容效果图:

PHP表单验证内容是否为空的实现代码

下面是验证程序的代码:

PHP表单验证内容是否为空的实现代码

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<!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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