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 > |
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 > |
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 > |
希望本文所述对大家学习php程序设计有所帮助。