Php 使用开/关复选框滑动开关运行SQL查询

我使用一个简单的开/关滑动开关来更新数据库中的字段

我把它“打开”没有问题，但允许用户“关闭”似乎给我带来了麻烦。我在这个页面上有多个开关，所以每当我“提交”时，它都会将“开”值切换到“关”，除非我删除elseif语句

代码似乎认为$_POST['check-twitter']在打开时为“isset”，但在我将其从打开切换到关闭时为“！isset”

如果我将代码改为“elseif（！isset…）”，那么当我再次进入页面时，它不会将“on”位置识别为“isset”，因此会自动将其关闭。它似乎与“isset”和“！isset”不一致

我希望开关仅在用户更改数据库时更新数据库，并且我需要开关向用户显示它是“打开”还是“关闭”

/$twitter\u check表示数据库中等于“是”或“否”的字段



当只有两个可能值时，应使用if…else
PHP代码必须包含在PHP标记中
$\u POST变量可以按原样使用，无需重新分配
我让它工作了

<?php

$sql = "SELECT * FROM XXXXXXX WHERE user_id = $id";

$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_array($result);

$twitter_check = $row['auto_post_twitter'];
$facebook_check = $row['fb_auto_post'];
$schedule_check = $row['weekly_email'];

    if(isset($_POST['submit'])){

        // CHECK TWITTER
        if(isset($_POST['check-twitter']) && $twitter_check == "No"){
        $sql_twitter = "UPDATE XXXXXXXX SET auto_post_twitter = 'Yes' WHERE user_id = $id";

        $result_twitter = mysqli_query($connection, $sql_twitter);
        $row_twitter = mysqli_fetch_array($result_twitter);

        } elseif(!isset($_POST['check-twitter']) && $twitter_check == "Yes") {
        $sql_twitter2 = "UPDATE XXXXXXXX SET auto_post_twitter = 'No' WHERE user_id = $id";

        $result_twitter2 = mysqli_query($connection, $sql_twitter2);
        $row_twitter2 = mysqli_fetch_array($result_twitter2);
        }

        // CHECK FACEBOOK
        if(isset($_POST['check-facebook']) && $facebook_check == "No"){
        $sql_facebook = "UPDATE XXXXXXX SET fb_auto_post = 'Yes' WHERE user_id = $id";

        $result_facebook = mysqli_query($connection, $sql_facebook);
        $row_facebook = mysqli_fetch_array($result_facebook);

        } elseif(!isset($_POST['check-facebook']) && $facebook_check == "Yes") {
        $sql_facebook2 = "UPDATE XXXXXX SET fb_auto_post = 'No' WHERE user_id = $id";

        $result_facebook2 = mysqli_query($connection, $sql_facebook2);
        $row_facebook2 = mysqli_fetch_array($result_facebook2);
        }

        // CHECK WEEKLY SCHEDULE
        if(isset($_POST['check-weekly']) && $schedule_check == "No"){
        $sql_weekly = "UPDATE XXXXXXX SET weekly_email = 'Yes' WHERE user_id = $id";

        $result_weekly = mysqli_query($connection, $sql_weekly);
        $row_weekly = mysqli_fetch_array($result_weekly);

        } elseif(!isset($_POST['check-weekly']) && $schedule_check == "Yes") {
        $sql_weekly2 = "UPDATE foodtruck_user SET weekly_email = 'No' WHERE user_id = $id";

        $result_weekly2 = mysqli_query($connection, $sql_weekly2);
        $row_weekly2 = mysqli_fetch_array($result_weekly2);
        }

        // REFRESH PAGE
        echo "<meta http-equiv='refresh' content='0'>";
        }

    ?>

<form method="POST" action="XXXXXXXXX">

<label class="switch">
  <input type="checkbox" name="check-twitter" <?php echo $twitter_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<label class="switch">
  <input type="checkbox" name="check-facebook" <?php echo $facebook_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<label class="switch">
  <input type="checkbox" name="check-weekly" <?php echo $schedule_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<input class="button" type="submit" name="submit" value="Save" />

</form>

您在哪里/如何定义
$twitter\u check
？这里没有足够的代码，如果确实使用了post方法。@Fred ii-正如我在帖子中所说，$twitter\u check表示数据库中等于“是”或“否”的字段。我的页面上显然有更多的代码显示SQL查询和表单，但这与理解我遇到的问题无关，我只是尝试在存在问题的地方展示代码。
<?php
// retrieve checkbox value from db
$check = /* db result (true|false) */;
?>

<label class="switch">
  <input type="checkbox" name="check-twitter" <?=$check && 'checked' ?> />
  <div class="slider"></div>
</label>

<?php
if($_POST['check-twitter']) {
// sql update checked
} else {
// sql update unchecked
}
?>

<input class="button" type="submit" value="Save"/>

<?php

$sql = "SELECT * FROM XXXXXXX WHERE user_id = $id";

$result = mysqli_query($connection, $sql);
$row = mysqli_fetch_array($result);

$twitter_check = $row['auto_post_twitter'];
$facebook_check = $row['fb_auto_post'];
$schedule_check = $row['weekly_email'];

    if(isset($_POST['submit'])){

        // CHECK TWITTER
        if(isset($_POST['check-twitter']) && $twitter_check == "No"){
        $sql_twitter = "UPDATE XXXXXXXX SET auto_post_twitter = 'Yes' WHERE user_id = $id";

        $result_twitter = mysqli_query($connection, $sql_twitter);
        $row_twitter = mysqli_fetch_array($result_twitter);

        } elseif(!isset($_POST['check-twitter']) && $twitter_check == "Yes") {
        $sql_twitter2 = "UPDATE XXXXXXXX SET auto_post_twitter = 'No' WHERE user_id = $id";

        $result_twitter2 = mysqli_query($connection, $sql_twitter2);
        $row_twitter2 = mysqli_fetch_array($result_twitter2);
        }

        // CHECK FACEBOOK
        if(isset($_POST['check-facebook']) && $facebook_check == "No"){
        $sql_facebook = "UPDATE XXXXXXX SET fb_auto_post = 'Yes' WHERE user_id = $id";

        $result_facebook = mysqli_query($connection, $sql_facebook);
        $row_facebook = mysqli_fetch_array($result_facebook);

        } elseif(!isset($_POST['check-facebook']) && $facebook_check == "Yes") {
        $sql_facebook2 = "UPDATE XXXXXX SET fb_auto_post = 'No' WHERE user_id = $id";

        $result_facebook2 = mysqli_query($connection, $sql_facebook2);
        $row_facebook2 = mysqli_fetch_array($result_facebook2);
        }

        // CHECK WEEKLY SCHEDULE
        if(isset($_POST['check-weekly']) && $schedule_check == "No"){
        $sql_weekly = "UPDATE XXXXXXX SET weekly_email = 'Yes' WHERE user_id = $id";

        $result_weekly = mysqli_query($connection, $sql_weekly);
        $row_weekly = mysqli_fetch_array($result_weekly);

        } elseif(!isset($_POST['check-weekly']) && $schedule_check == "Yes") {
        $sql_weekly2 = "UPDATE foodtruck_user SET weekly_email = 'No' WHERE user_id = $id";

        $result_weekly2 = mysqli_query($connection, $sql_weekly2);
        $row_weekly2 = mysqli_fetch_array($result_weekly2);
        }

        // REFRESH PAGE
        echo "<meta http-equiv='refresh' content='0'>";
        }

    ?>

<form method="POST" action="XXXXXXXXX">

<label class="switch">
  <input type="checkbox" name="check-twitter" <?php echo $twitter_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<label class="switch">
  <input type="checkbox" name="check-facebook" <?php echo $facebook_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<label class="switch">
  <input type="checkbox" name="check-weekly" <?php echo $schedule_check == 'Yes'?'checked':''; ?>>
  <div class="slider"></div>
</label><br/>

<input class="button" type="submit" name="submit" value="Save" />

</form>