PHP验证(邮箱,姓名,url)

// 定义变量并设置为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "Name is required";
} else {
$name = test_input($_POST["name"]);
// 检查名字是否包含字母和空格
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "Only letters and white space allowed";
}
}

if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = test_input($_POST["email"]);
// 检查电邮地址语法是否有效
if (!preg_match("/([\w-]+@[\w-]+.[\w-]+)/",$email)) {
$emailErr = "Invalid email format";
}
}

if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($POST["website"]);
// 检查 URL 地址语言是否有效(此正则表达式同样允许 URL 中的下划线)
if (!preg_match("/\b(?:(?:https?|ftp)://|www.)[-a-z0-9+&@#/%?=~
|!:,.;]*[-a-z0-9+&@#/%
=~_|]/i",$website)) {
$websiteErr = "Invalid URL";
}
}

if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
}

if (empty($_POST["gender"])) {
$genderErr = "Gender is required";
} else {
$gender = test_input($_POST["gender"]);
}
}

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