PHP教學-表單驗證 - 驗證 E-mail 和 URL
PHP - 驗證名字
以下程式碼展示的簡單方法檢查 name 字段是否包含字母和空格。如果 name 字段無效，則存儲一條錯誤消息：
$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允許字母和空格！";
}
註釋：preg_match() 函數檢索字串的模式，如果模式存在則返回 true，否則返回 false。
PHP - 驗證 E-mail
PHP - 驗證 E-mail
以下程式碼展示的簡單方法檢查 e-mail 地址語法是否有效。如果無效則存儲一條錯誤消息：
$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允許字母和空格！";
}
PHP - 驗證 URL
以下程式碼展示的方法檢查 URL 地址語法是否有效（這條正則表達式同時允許 URL 中的斜槓）。如果 URL 地址語法無效，則存儲一條錯誤消息：
$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允許字母和空格！";
}
PHP - 驗證 Name、E-mail、以及 URL
現在，scripts是這樣的：
範例
範例
<?php
// 定義變數並設置為空值
$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"]);
// 檢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"]);
// 檢查電郵地址語法是否有效
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
$emailErr = "Invalid email format";
}
}
if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
// 檢查 URL 地址語言是否有效（此正則表達式同樣允許 URL 中的下劃線）
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"]);
}
}
?>
完整範例
<!DOCTYPE HTML>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
// 定義變數並設置為空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "姓名是必填的";
} else {
$name = test_input($_POST["name"]);
// 檢查姓名是否包含字母和空白字符
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允許字母和空格";
}
}
if (empty($_POST["email"])) {
$emailErr = "電郵是必填的";
} else {
$email = test_input($_POST["email"]);
// 檢查電子郵件地址語法是否有效
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
$emailErr = "無效的 email 格式";
}
}
if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
// 檢查 URL 地址語法是否有效（正則表達式也允許 URL 中的斜槓）
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
$websiteErr = "無效的 URL";
}
}
if (empty($_POST["comment"])) {
$comment = "";
} else {
$comment = test_input($_POST["comment"]);
}
if (empty($_POST["gender"])) {
$genderErr = "性別是必選的";
} else {
$gender = test_input($_POST["gender"]);
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<h2>PHP 驗證範例</h2>
<p><span class="error">* 必需的字段</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
姓名：<input type="text" name="name">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>
電郵：<input type="text" name="email">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
網址：<input type="text" name="website">
<span class="error"><?php echo $websiteErr;?></span>
<br><br>
評論：<textarea name="comment" rows="5" cols="40"></textarea>
<br><br>
性別：
<input type="radio" name="gender" value="female">女性
<input type="radio" name="gender" value="male">男性
<span class="error">* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="提交">
</form>
<?php
echo "<h2>您的輸入：</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>
</body>
</html>
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