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
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< 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 >
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welcome.php
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< 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 >
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2.PHP表单验证完整实例
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< 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 $data;
}
?>
< h2 >PHP 验证实例</ h2 >
< p >< span class = "error" >* 必需的字段</ span ></ p >
<!--htmlspecialchars() 函数把特殊字符转换为 HTML 实体。-->
< form method = "post" action = "<?php echo htmlspecialchars($_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>您的输入:</ h2 >";
echo $name;
echo "< br >";
echo $email;
echo "< br >";
echo $website;
echo "< br >";
?>
</ body >
</ html >
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希望本文所述对大家学习php程序设计有所帮助。