互联网程序设计·PHP语言之表单进阶

互联网程序设计·PHP语言之表单进阶

第1关 表单验证 – 安全的资料填写

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
    <label>
        名字：<input type="text" name="name">
    </label>
    <label>
        年龄：<input type="text" name="age">
    </label>
    <input type="submit" value="提交">
</form>
<?php
$name = $age = '';

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    $name = formatted_input($_POST['name']);
    $age = formatted_input($_POST['age']);
    echo '欢迎'.$name.'，你今年'.$age.'岁';
}

/********** Begin *********/
function formatted_input($val){
    $val = htmlspecialchars($val);
    $val = trim($val);
    $val = stripslashes($val);
    return $val;
}


/********** End *********/
?>
</body>
</html>

第2关 必需字段验证 – 一个完整的表单实例（一）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .error {color: #FF0000;}
    </style>
</head>
<body>
<?php
$nameErr = $emailErr = $genderErr = '';
$name = $email = $gender = $comment = $website = '';
/********** Begin *********/

   if (empty($_POST['name'])) {  
        $nameErr = '名字是必需的';  
    } else {  
        $name = formatted_input($_POST['name']);  
    }
    if (empty($_POST['email'])) {  
        $emailErr = '邮箱是必需的';  
    } else {  
        $email = formatted_input($_POST['email']);  
    }
    if (empty($_POST['gender'])) {  
        $genderErr = '性别是必需的';  
    } else {  
        $gender = formatted_input($_POST['gender']);  
    }   

/********** End *********/
function formatted_input($data)
{
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}
?>

<p>
    <span class="error">* 为必需字段</span>
</p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
    <label>
        姓名：<input type="text" name="name">
    </label>
    <span class="error">* <?php echo $nameErr;?></span>
    <br><br>
    <label>
        邮箱：<input type="text" name="email">
        <span class="error">* <?php echo $emailErr;?></span>
    </label>
    <br><br>
    <label>
        博客：<input type="text" name="website">
    </label>
    <br><br>
    <label>
        备注：<textarea name="comment" rows="5" cols="40"></textarea>
    </label>
    <br><br>
    <label>
        性别：<input type="radio" name="gender" value="male">男
        <input type="radio" name="gender" value="female">女
        <span class="error">* <?php echo $genderErr;?></span>
    </label>
    <br><br>
    <input type="submit" name="submit" value="提交">
</form>

<?php

   
    echo '你输入的内容是：'."<br>";
    echo $name."<br>";
    echo $email."<br>";
    echo $website."<br>";
    echo $comment."<br>";
    echo $gender."<br>";
?>
</body>
</html>

第3关 邮箱地址和URL验证 – 一个完整的表单实例（二）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .error {color: #FF0000;}
    </style>
</head>
<body>
<?php
$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 {
        $name = formatted_input($_POST['name']);
        /********** Begin *********/
        if (!preg_match("/^[a-zA-Z ]*$/", $name)) {  
            $nameErr = '只允许字母和空格';  
            $name = ''; //格式非法，将$name变量清空  
        }  
        /********** End *********/
    }
    if (empty($_POST['email'])) {
        $emailErr = '邮箱是必需的';
    } else {
        $email = formatted_input($_POST['email']);
        /********** Begin *********/

        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {  
            $emailErr = '非法的邮箱格式';  
            $email = '';  //格式非法，将$email变量清空  
        }  

        /********** End *********/
    }
    if (empty($_POST['website'])) {
        $website = '';
    } else {
        $website = formatted_input($_POST['website']);
        /********** Begin *********/

            if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {  
        $websiteErr = '非法的 URL 地址';  
        $website = '';  //格式非法，将$website变量清空  
    }  

        /********** End *********/
    }
    if (empty($_POST['comment'])) {
        $comment = '';
    } else {
        $comment = formatted_input($_POST['comment']);
    }
    if (empty($_POST['gender'])) {
        $genderErr = '性别是必需的';
    } else {
        $gender = formatted_input($_POST['gender']);
    }
}
function formatted_input($data)
{
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}
?>

<p>
    <span class="error">* 为必需字段</span>
</p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
    <label>
        姓名：<input type="text" name="name">
    </label>
    <span class="error">* <?php echo $nameErr;?></span>
    <br><br>
    <label>
        邮箱：<input type="text" name="email">
        <span class="error">* <?php echo $emailErr;?></span>
    </label>
    <br><br>
    <label>
        博客：<input type="text" name="website">
        <span class="error"><?php echo $websiteErr;?></span>
    </label>
    <br><br>
    <label>
        备注：<textarea name="comment" rows="5" cols="40"></textarea>
    </label>
    <br><br>
    <label>
        性别：<input type="radio" name="gender" value="male">男
        <input type="radio" name="gender" value="female">女
        <span class="error">* <?php echo $genderErr;?></span>
    </label>
    <br><br>
    <input type="submit" name="submit" value="提交">
</form>

<?php
echo '你输入的内容是：'."<br>";
echo $name."<br>";
echo $email."<br>";
echo $website."<br>";
echo $comment."<br>";
echo $gender."<br>";
?>
</body>
</html>

第4关 综合运用 – 一个完整的表单实例（三）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .error {color: #FF0000;}
    </style>
</head>
<body>
<?php
$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 {
        $name = formatted_input($_POST['name']);
        /********** Begin *********/
        if (!preg_match("/^[a-zA-Z ]*$/", $name)) {  
            $nameErr = '只允许字母和空格';  
            $name = ''; //格式非法，将$name变量清空  
        }  
        /********** End *********/
    }
    if (empty($_POST['email'])) {
        $emailErr = '邮箱是必需的';
    } else {
        $email = formatted_input($_POST['email']);
        /********** Begin *********/

        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {  
            $emailErr = '非法的邮箱格式';  
            $email = '';  //格式非法，将$email变量清空  
        }  

        /********** End *********/
    }
    if (empty($_POST['website'])) {
        $website = '';
    } else {
        $website = formatted_input($_POST['website']);
        /********** Begin *********/

            if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {  
        $websiteErr = '非法的 URL 地址';  
        $website = '';  //格式非法，将$website变量清空  
    }  

        /********** End *********/
    }
    if (empty($_POST['comment'])) {
        $comment = '';
    } else {
        $comment = formatted_input($_POST['comment']);
    }
    if (empty($_POST['gender'])) {
        $genderErr = '性别是必需的';
    } else {
        $gender = formatted_input($_POST['gender']);
    }
}
function formatted_input($data)
{
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}
?>

<p>
    <span class="error">* 为必需字段</span>
</p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>">
    <label>
        姓名：<input type="text" name="name">
    </label>
    <span class="error">* <?php echo $nameErr;?></span>
    <br><br>
    <label>
        邮箱：<input type="text" name="email">
        <span class="error">* <?php echo $emailErr;?></span>
    </label>
    <br><br>
    <label>
        博客：<input type="text" name="website">
        <span class="error"><?php echo $websiteErr;?></span>
    </label>
    <br><br>
    <label>
        备注：<textarea name="comment" rows="5" cols="40"></textarea>
    </label>
    <br><br>
    <label>
        性别：<input type="radio" name="gender" value="male">男
        <input type="radio" name="gender" value="female">女
        <span class="error">* <?php echo $genderErr;?></span>
    </label>
    <br><br>
    <input type="submit" name="submit" value="提交">
</form>

<?php
echo '你输入的内容是：'."<br>";
echo $name."<br>";
echo $email."<br>";
echo $website."<br>";
echo $comment."<br>";
echo $gender."<br>";
?>
</body>
</html>
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linwute
linwute

我要像梦一样自由，像大地一样宽容；
在艰辛放逐的路上，点亮生命的光芒；
我要像梦一样自由，像天空一样坚强；
在曲折蜿蜒的路上，体验生命的意义；

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