作业一

要求

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<h1 >php简单计算器</h1>
<form  method="post">
    <table>
        <tr>
            <td >请输入第一个数</td><td><input type="text" name="first"></td>
        </tr>
        <tr>
            <td>请输入第二个数</td><td><input type="text" name="second"></td>
        </tr>
        <tr>
            <td>
                请选择运算符
                <select name="operator">
                    <option value="+">+</option>
                    <option value="-">-</option>
                    <option value="*">+</option>
                    <option value="/">-</option>
                    <option value="%">%</option>
                </select>
            </td>
        </tr>
        <tr>
            <td><input type="submit" value="提交"></td>
            <td><input type="reset" value="重置"></td>
        </tr>
    </table>
</form>
<?php
$first=$_POST['first'];
$second=$_POST['second'];
$operator=$_POST['operator'];
echo '结果为:';
if ( $operator == '+' ) {
    echo $first+$second;
}
if($operator == '-') {
    echo $first-$second;
}
if($operator == '*') {
    echo $first*$second;
}if($operator == '/') {
    echo $first/$second;
}
if ($operator=='%'){
    echo $first%$second;
}
?>
</body>
</html><br>

结果:

作业二

要求

代码

<html>
<head>
    <meta charset="utf-8">
    <title>legroft</title>
    <style>
        .error{
            color: red;
        }
    </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{
        $name=test_input($_POST["name"]);
        if (!preg_match("/^[a-zA-Z]/",$name)){
            $nameErr="只允许字母";
        }
    }
    if (empty($_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 $data;
}
?>
<h2>PHP表单验证</h2>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
    名字:<input type="text" name="name" value="<?php echo $name;?>">
    <span class="error">*<?php echo $nameErr?></span>
    E-mail:<input type="text" name="email" value="<?php echo $email;?>">
    <span class="error">*<?php echo $emailErr?></span>
    网址:<input type="text" name="website" value="<?php echo $website;?>">
    <span class="error">*<?php echo $websiteErr?></span>
    <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 $genderErr;?></span>
    <br><br>
    <input type="submit" name="submit" value="Submit">
    <?php echo '<br>您输入的信息为<br>',$name,'<br>',$email,'<br>',$website,'<br>',$comment?>
</form>
</body>
</html>

结果:

Last modification:July 12th, 2020 at 01:08 am