头歌php 表单语言进阶

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

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

/********** 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 *********/
/********** 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 *********/
/********** 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 *********/  

/********** Begin *********/  
$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']);  
        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  
        }  
    }  
    if (empty($_POST['email'])) {  
        $emailErr = '邮箱是必需的';  
    } else {  
        $email = formatted_input($_POST['email']);  
        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  
        }  
    }  
    if (empty($_POST['website'])) {  
        $website = '';  
    } else {  
        $website = formatted_input($_POST['website']);  
        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  
        }  
    }  
    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 $data;  
}  
/********** End *********/
<!--     Begin     -->  
<form method="post" action="<?php echo htmlspecialchars($_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>  
<!--     End     -->