WordPress纯代码实现用户关注功能

发布于 2023.02.14

用户关注功能可能最早出现在的是微博上，登录用户可以关注别人，自己也可以被关注，那们使用 WordPress 开…

用户关注功能可能最早出现在的是微博上，登录用户可以关注别人，自己也可以被关注，那们使用 WordPress 开发带用户注册的主题的时候是否也可以实现关注功能的，答案是肯定的，今天就给大家分享一下使用纯代码实现 WordPress 用户关注功能的实现方法。首先，将下面的代码放到您的 functions.php 文件中。

```
function wpdiary_user_guanzhu(){
```
```
 
```
```
    if(!get_current_user_id()){
```

        exit(json_encode(['msg'=>'请登录!']));

```
    }
```

    if( $_POST['user']==get_current_user_id()){

        exit(json_encode(['msg'=>'你不能关注自己!']));

```
    }
```
```
 
```
```
    $user = $_POST['user'];
```

    $meta = get_user_meta(get_current_user_id(),'guanzhu',true);

    $bguanzhu1 = explode(',',get_user_meta($user,'bguanzhu',true));

    $bguanzhu = array_filter($bguanzhu1);

    $guanzhu1 = explode(',',get_user_meta(get_current_user_id(),'guanzhu',true));

```
    $guanzhu = array_filter($guanzhu1);
```
```
    if(in_array($user,$guanzhu)){
```
```
 
```
```
        foreach($guanzhu as $k=>$v){
```
```
            if($v==$user){
```
```
                unset($guanzhu[$k]);
```
```
            }
```
```
        }
```
```
 
```
```
        foreach($bguanzhu as $k=>$v){
```

            if($v==get_current_user_id()){

```
                unset($bguanzhu[$k]);
```
```
            }
```
```
        }
```
```
 
```

        update_user_meta(get_current_user_id(),'guanzhu',implode(",",$guanzhu));

        update_user_meta($user,'bguanzhu',implode(",",$bguanzhu));

        exit(json_encode(['msg'=>'取消成功!']));

```
    }else{
```
```
        array_push($guanzhu,$user);
```

        array_push($bguanzhu,get_current_user_id());

        update_user_meta(get_current_user_id(),'guanzhu',implode(",",$guanzhu));

        update_user_meta($user,'bguanzhu',implode(",",$bguanzhu));

        exit(json_encode(['msg'=>'关注成功!']));

```
    }
```
```
 
```
```
}
```
```
 
```

add_action('wp_ajax_guanzhu','wpdiary_user_guanzhu');

add_action('wp_ajax_nopriv_guanzhu','wpdiary_user_guanzhu');

```
//获取指定用户关注数量
```

function get_wpdiary_guanzhu_count($authorID){

    $meta = get_user_meta($authorID,'guanzhu',true);

```
    if($meta){
```

        $guanzhu = explode(",",get_user_meta($authorID,'guanzhu',true));

```
        return count($guanzhu);
```
```
    }else{
```
```
        return 0;
```
```
    }
```
```
 
```
```
}
```
```
//获取指定用户被关注数量
```

function get_wpdiary_bguanzhu_count($authorID){

    $meta = get_user_meta($authorID,'bguanzhu',true);

```
    if($meta){
```

        $bguanzhu = explode(",",get_user_meta($authorID,'bguanzhu',true));

```
        return count($bguanzhu);
```
```
    }else{
```
```
        return 0;
```
```
    }
```
```
 
```
```
}
```

其次，消息提示使用了 layer 这个 jQuery 弹出层插件，所以，您还需要在主题中引入这个框架的文件（下载地址：http://res.layui.com/static/download/layer/layer-v3.1.1.zip），下载后把整个文件夹放到您的主题目录中，然后在主题头部引入 layer.js，并将下面的 JS 代码放到您的 footer.php 中。

```
<script>
```
```
    $('a.addfollow').click(function(){
```
```
		var user = $(this).attr('user');
```
```
		$.ajax({ 
```
```
			url: "/wp-admin/admin-ajax.php", 
```
```
			type:'post',
```
```
			dataType:'json',
```
```
			data:{action:'guanzhu',user:user}, 
```
```
			success: function(data){
```

			    layer.alert(data.msg, function(){

```
		 			location.reload();
```
```
		 		});
```
```
	  		}
```
```
		});
```
```
	});
```
```
</script>
```

第三，将关注按钮放到您需要放的地方，比如用户列表中或作者存档页，关注按钮代码如下：

```
<?php 
```

$meta = get_user_meta(get_current_user_id(),'guanzhu',true);

$user = ‘要被关注的用户的ID’

```
if($meta){
```
```
    $guanzhu = explode(',',$meta);
```
```
}else{
```
```
    $guanzhu = array();
```
```
}
```
```
if(in_array($user,$guanzhu)){?>
```

    <a href="javascript:;" user="<?php echo $user;?>" class="addfollow focus-link">+取消关注</a>

```
<?php }else{?>
```

    <a href="javascript:;" user="<?php echo $user;?>" class="addfollow focus-link">+ 关注</a>

```
<?php }?>
```

第四，获取指定用户关注和被关注数量：

<?php echo get_wpdiary_guanzhu_count(‘用户ID’);?>//获取指定用户关注数量

<?php echo get_wpdiary_bguanzhu_count(‘用户ID’);?>//获取指定用户被关注数量

第五，如何获取当前登录用户关注的用户的列表：

```
<?php 
```

    $user_id = get_current_user_id();//当前登录用户id，也可以指定为某个ID的用户，这样获取到的就是指定ID的用户的关注列表

	$meta = get_user_meta($user_id,'guanzhu',true);

```
	$guanzhulist = explode(',',$meta );
```

	$users = get_users(array('include'=>$guanzhulist));

```
?>
```
```
<?php foreach($users as $user){ ?>
```
```
    <li class="pic-btn-li">
```
```
        <div class="li-pic">
```

            <a href="<?php%20echo%20get_author_posts_url(%20$user->ID);%20?>/?userid=<?php%20echo%20$user->ID;?>" target="_blank" class="li-link">

               <?php echo get_avatar($user->ID);?>

```
            </a>
```
```
        </div>
```
```
        <div class="li-dec">
```
```
            <p class="dec-name">
```

                <a href="<?php%20echo%20get_author_posts_url(%20$user->ID);%20?>/?userid=<?php%20echo%20$user->ID;?>" target="_blank" class="dec-name-link"><?php echo $user->nickname;?></a>

```
            </p>
```
```
            <p class="dec-sub">
```

                <span class="dec-fans">粉丝 <?php echo get_wpdiary_bguanzhu_count($user->ID);?></span>

```
            </p>
```
```
        </div>
```

        <a href="javascript:;" user="<?php echo $user->ID;?>" class="addfollow sp-mod-button" title="关注他">取消</a>

```
    </li>
```
```
<?php } ?>
```

第六，获取关注过当前登录用户的列表（被关注列表，也可以说是粉丝列表）：

```
<?php 
```

    $user_id = get_current_user_id();//当前登录用户id，也可以指定为某个ID的用户，这样获取到的就是关注过指定ID的用户列表（粉丝列表）

    $bguanzhu = get_user_meta($user_id,'bguanzhu',true);

    $fanslist = explode(',',$bguanzhu );

    $fans = get_users(array('include'=>$fanslist));

```
?>
```
```
<?php foreach($fans as $fensi){ ?>
```
```
    <li class="pic-btn-li">
```
```
        <div class="li-pic">
```

            <a href="<?php%20echo%20get_author_posts_url(%20$fensi->ID);%20?>/?userid=<?php%20echo%20$fensi->ID;?>" target="_blank" class="li-link">

               <?php echo get_avatar($fensi->ID);?>

```
            </a>
```
```
        </div>
```
```
        <div class="li-dec">
```
```
            <p class="dec-name">
```

                <a href="<?php%20echo%20get_author_posts_url(%20$fensi->ID);%20?>/?userid=<?php%20echo%20$fensi->ID;?>" target="_blank" class="dec-name-link"><?php echo $fensi->nickname;?></a>

```
            </p>
```
```
            <p class="dec-sub">
```

                <span class="dec-fans">粉丝 <?php echo get_wpdiary_bguanzhu_count($fensi->ID);?></span>

```
            </p>
```
```
        </div>
```
```
        <?php 
```

        $meta = get_user_meta(get_current_user_id(),'guanzhu',true);

```
        $user = $fensi->ID;
```
```
        if($meta){
```

            $guanzhu = explode(',',get_user_meta(get_current_user_id(),'guanzhu',true));

```
        }else{
```
```
            $guanzhu = array();
```
```
        }
```
```
        if(in_array($user,$guanzhu)){?>
```

            <a href="javascript:;" user="<?php echo $fensi->ID;?>" class="addfollow sp-mod-button" title="取消关注">已互关</a>

```
        <?php }else{?>
```

            <a href="javascript:;" user="<?php echo $fensi->ID;?>" class="addfollow sp-mod-button" title="关注他">关注他</a>

```
        <?php }?>
```
```
    </li>
```
```
<?php } ?>
```

好了，就这些了，用心的朋友仔细看一看代码还会让你的关注功能更加的丰富，希望对大家有用！

类别：WordPress教程、

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