php編程必學之表單驗證
php編程每天必學之表單驗證，針對php表單處理進行學習研究，以一個完整例子實現了php表單驗證，感興趣的小伙伴們可以參考一下.
本文實例講解了php表單驗證的實現方法，分享給大家供大家參考，具體內容如下
1.PHP表單處理
welcome.html
<html>
<body>
<form action="welcome.php" method="post">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<input type="submit">
</form>
</body>
</html>
welcome.php
<html>
<body>
<!--PHP 超全局變量 $_GET 和 $_POST 用于收集表單數據（form-data)-->
Welcome <?php echo $_POST["name"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?>
</body>
</html>
2.PHP表單驗證完整實例
<html>
<head>
</head>
<body>
<?php
/pic/strong>
$nameErr = $emailErr = $websiteErr = "";
$name = $email = $website = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["name"])) {
$nameErr = "姓名是必填的";
} else {
$name = test_input($_POST["name"]);
/pic/p>
/pic/p>
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"]);
/pic/p>
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"]);
/pic/p>
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
$websiteErr = "無效的 URL";
}
}
}
function test_input($data) {
/pic/p>
$data = trim($data);
/pic/p>
$data = stripslashes($data);
/pic/p>
$data = htmlspecialchars($data);
return $data;
}
?>
<h2>PHP 驗證實例</h2>
<p><span class="error">* 必需的字段</span></p>
<!--htmlspecialchars() 函數把特殊字符轉換為 HTML 實體。-->
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<!--value:保留表單中的值-->
姓名：<input type="text" name="name" value="<?php echo $name;?>">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>
郵箱：<input type="text" name="email" value="<?php echo $email;?>">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
網址：<input type="text" name="website" value="<?php echo $website;?>">
<span class="error"><?php echo $websiteErr;?></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>";
?>
</body>
</html>
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