11月18日_POST请求和PHP函数

POST请求：

html代码：

<form action="" method="post">
            <label for="email">邮箱:</label>
            <input type="email" id="email" name="email" value="<?php echo isset($_POST['email']) ? $_POST['email'] : ''; ?>">
            <label for="password">密码:</label>
            <input type="password" id="password" name="password" value="<?php echo isset($_POST['email']) ? $_POST['email'] : '';?>">
            <button>登录</button>
        </form>`

PHP代码：

<?php
    print_r($_POST);
    echo $_POST['email'];
    if (isset($_POST['email'])) {
        echo $_POST['email'];
    } else {  
        $_POST['email'] = '';
    }
    echo isset($_POST['email']) ? $_POST['email'] : '';
    echo '<pre>';
    print_r($_POST);
?>

手抄作业：