PHP表单验证内容是否为空的实现代码

<!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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PHP表单验证内容是否为空的实现代码

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