php编程每天必学之表单验证，php编程表单
本文实例讲解了php表单验证的实现方法，分享给大家供大家参考，具体内容如下
1.PHP表单处理
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 超全局变量 $_GET 和 $_POST 用于收集表单数据（form-data)--> Welcome <?php echo $_POST["name"]; ?><br> Your email address is: <?php echo $_POST["email"]; ?> </body> </html>
2.PHP表单验证完整实例
<html>
<head>
</head>
<body>
<?php
// 定义变量并设置为空值
$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"]);
// 检查姓名是否包含字母和空白字符
//preg_match() 函数检索字符串的模式，如果模式存在则返回 true，否则返回 false。
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "只允许字母和空格";
}
}
if (empty($_POST["email"])) {
$emailErr = "电邮是必填的";
} else {
$email = test_input($_POST["email"]);
// 检查电子邮件地址语法是否有效
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
$emailErr = "无效的 email 格式";
}
}
if (empty($_POST["website"])) {
$website = "";
} else {
$website = test_input($_POST["website"]);
// 检查 URL 地址语法是否有效（正则表达式也允许 URL 中的斜杠）
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
$websiteErr = "无效的 URL";
}
}
}
function test_input($data) {
//去除用户输入数据中不必要的字符（多余的空格、制表符、换行）
$data = trim($data);
//删除用户输入数据中的反斜杠（\）
$data = stripslashes($data);
//把特殊字符转换为 HTML 实体
$data = htmlspecialchars($data);
return $data;
}
?>
<h2 id="PHP-验证实例">PHP 验证实例</h2>
<p><span class="error">* 必需的字段</span></p>
<!--htmlspecialchars() 函数把特殊字符转换为 HTML 实体。-->
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<!--value:保留表单中的值-->
姓名：<input type="text" name="name" value="<?php echo $name;?>">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>
邮箱：<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>
<input type="submit" name="submit" value="提交">
</form>
<?php
echo "<h2 id="您的输入">您的输入：</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
?>
</body>
</html>
希望本文所述对大家学习php程序设计有所帮助。
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