完整表单实例
在用户点击提交按钮后，为确保字段值是否输入正确，我们在HTML的input元素中插添加PHP脚本， 各字段名为: name, email, 和 website。 在备注中的 textarea 字段中，我们将脚本放于 <textarea> 和 </textarea> 标签之间。
PHP脚本输出值为： $name, $email, $website, 和 $comment 变量。
然后，我们同样需要检查被选中的单选按钮， 对于这一点，我们 必须设置好checked属性(不是radio按钮的 value 属性) :
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 名字: <input type="text" name="name" value="<?php echo $name;?>"> <span>* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email" value="<?php echo $email;?>"> <span>* <?php echo $emailErr;?></span> <br><br> 网址: <input type="text" name="website" value="<?php echo $website;?>"> <span><?php echo $websiteErr;?></span> <br><br> 备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> <br><br> 性别: <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">女 <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">男 <span>* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form>
PHP - 完整表单实例
以下是完整的PHP表单验证实例代码：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>php.cn</title>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
// 定义变量并默认设置为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST")
{
if (empty($_POST["name"]))
{
$nameErr = "名字是必需的";
}
else
{
$name = test_input($_POST["name"]);
// 检测名字是否只包含字母跟空格
if (!preg_match("/^[a-zA-Z ]*$/",$name))
{
$nameErr = "只允许字母和空格";
}
}
if (empty($_POST["email"]))
{
$emailErr = "邮箱是必需的";
}
else
{
$email = test_input($_POST["email"]);
// 检测邮箱是否合法
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
{
$emailErr = "非法邮箱格式";
}
}
if (empty($_POST["website"]))
{
$website = "";
}
else
{
$website = test_input($_POST["website"]);
// 检测 URL 地址是否合法
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
{
$websiteErr = "非法的 URL 的地址";
}
}
if (empty($_POST["comment"]))
{
$comment = "";
}
else
{
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["gender"]))
{
$genderErr = "性别是必需的";
}
else
{
$gender = test_input($_POST["gender"]);
}
}
function test_input($data)
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?><h2>PHP 表单验证实例</h2> <p><span class="error">* 必需字段。</span></p> <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 名字: <input type="text" name="name" value="<?php echo $name;?>"> <span class="error">* <?php echo $nameErr;?></span> <br><br> E-mail: <input type="text" name="email" value="<?php echo $email;?>"> <span class="error">* <?php echo $emailErr;?></span> <br><br> 网址: <input type="text" name="website" value="<?php echo $website;?>"> <span class="error"><?php echo $websiteErr;?></span> <br><br> 备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea> <br><br> 性别: <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?> value="female">女 <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?> value="male">男 <span class="error">* <?php echo $genderErr;?></span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <?php echo "<h2>您输入的内容是:</h2>"; echo $name; echo "<br>"; echo $email; echo "<br>"; echo $website; echo "<br>"; echo $comment; echo "<br>"; echo $gender; ?> </body> </html>
原理：在input标签中嵌入PHP脚本。
如果type=”text”,那么就嵌入value=”<?php echo $valuableName; ?>”
如果type=”radio”,那么就嵌入<?php if (isset($valuableName) && $valuableName==”value1”) echo “checked”;?>
