吴裕雄--天生自然 PHP开发学习：表单

$name = test_input($_POST["name"]);

if (!preg_match("/^[a-zA-Z ]*$/",$name)) {

  $nameErr = "只允许字母和空格";

}

$email = test_input($_POST["email"]);

if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {

  $emailErr = "非法邮箱格式";

}

$website = test_input($_POST["website"]);

if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {

  $websiteErr = "非法的 URL 的地址";

}

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

<style>

.error {color: #FF0000;}

</style>

</head>

<body> 

<?php

// 定义变量并默认设置为空值

$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"]);

         // 检测名字是否只包含字母跟空格

         if (!preg_match("/^[a-zA-Z ]*$/",$name)) {

         $nameErr = "只允许字母和空格";

         }

     }

   if (empty($_POST["email"])) {

      $emailErr = "Email is required";

   } else {

      $email = test_input($_POST["email"]);

      // 检测邮箱是否合法

      if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {

         $emailErr = "非法邮箱格式";

      }

   }

   if (empty($_POST["website"])) {

      $website = "";

   } else {

      $website = test_input($_POST["website"]);

      // 检测 URL 地址是否合法

     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {

         $websiteErr = "非法的 URL 的地址";

      }

   }

   if (empty($_POST["comment"])) {

      $comment = "";

   } else {

      $comment = test_input($_POST["comment"]);

   }

   if (empty($_POST["gender"])) {

      $genderErr = "性别是必需的";

   } else {

      $gender = test_input($_POST["gender"]);

   }

}

function test_input($data) {

   $data = trim($data);

   $data = stripslashes($data);

   $data = htmlspecialchars($data);

   return $data;

}

?>

<h2>PHP 表单验证实例</h2>

<p><span class="error">* 必需字段。</span></p>

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">

   名字: <input type="text" name="name">

   <span class="error">* <?php echo $nameErr;?></span>

   <br><br>

   E-mail: <input type="text" name="email">

   <span class="error">* <?php echo $emailErr;?></span>

   <br><br>

   网址: <input type="text" name="website">

   <span class="error"><?php echo $websiteErr;?></span>

   <br><br>

   备注: <textarea name="comment" rows="5" cols="40"></textarea>

   <br><br>

   性别:

   <input type="radio" name="gender" value="female">女

   <input type="radio" name="gender" value="male">男

   <span class="error">* <?php echo $genderErr;?></span>

   <br><br>

   <input type="submit" name="submit" value="Submit">

</form>

<?php

echo "<h2>您输入的内容是:</h2>";

echo $name;

echo "<br>";

echo $email;

echo "<br>";

echo $website;

echo "<br>";

echo $comment;

echo "<br>";

echo $gender;

?>

</body>

</html>

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<title>菜鸟教程(runoob.com)</title>

<style>

.error {color: #FF0000;}

</style>

</head>

<body> 

<?php

// 定义变量并默认设置为空值

$nameErr = $emailErr = $genderErr = $websiteErr = "";

$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")

{

    if (empty($_POST["name"]))

    {

        $nameErr = "名字是必需的";

    }

    else

    {

        $name = test_input($_POST["name"]);

        // 检测名字是否只包含字母跟空格

        if (!preg_match("/^[a-zA-Z ]*$/",$name))

        {

            $nameErr = "只允许字母和空格";

        }

    }

    if (empty($_POST["email"]))

    {

      $emailErr = "邮箱是必需的";

    }

    else

    {

        $email = test_input($_POST["email"]);

        // 检测邮箱是否合法

        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))

        {

            $emailErr = "非法邮箱格式";

        }

    }

    if (empty($_POST["website"]))

    {

        $website = "";

    }

    else

    {

        $website = test_input($_POST["website"]);

        // 检测 URL 地址是否合法

        if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))

        {

            $websiteErr = "非法的 URL 的地址";

        }

    }

    if (empty($_POST["comment"]))

    {

        $comment = "";

    }

    else

    {

        $comment = test_input($_POST["comment"]);

    }

    if (empty($_POST["gender"]))

    {

        $genderErr = "性别是必需的";

    }

    else

    {

        $gender = test_input($_POST["gender"]);

    }

}

function test_input($data)

{

    $data = trim($data);

    $data = stripslashes($data);

    $data = htmlspecialchars($data);

    return $data;

}

?>

<h2>PHP 表单验证实例</h2>

<p><span class="error">* 必需字段。</span></p>

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">

   名字: <input type="text" name="name" value="<?php echo $name;?>">

   <span class="error">* <?php echo $nameErr;?></span>

   <br><br>

   E-mail: <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>

   备注: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>

   <br><br>

   性别:

   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">女

   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">男

   <span class="error">* <?php echo $genderErr;?></span>

   <br><br>

   <input type="submit" name="submit" value="Submit">

</form>

<?php

echo "<h2>您输入的内容是:</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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