php表单的验证详解
2021-05-02 02:29
YPE HTML>
"utf-8">
.error {color: #FF0000;}
// 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;
}
?>
PHP 表单验证实例
class="error">* 必需字段。
名字: "text" name="name" value="">
class="error">* echo $nameErr;?>
E-mail: "text" name="email" value="">
class="error">* echo $emailErr;?>
网址: "text" name="website" value="">
class="error">echo $websiteErr;?>
备注:
性别:
"radio" name="gender" if (isset($gender) && $gender=="female") echo "checked";?> value="female">女
"radio" name="gender" if (isset($gender) && $gender=="male") echo "checked";?> value="male">男
class="error">* echo $genderErr;?>
"submit" name="submit" value="Submit">
echo "您输入的内容是:
";
echo $name;
echo "
";
echo $email;
echo "
";
echo $website;
echo "
";
echo $comment;
echo "
";
echo $gender;
?>