在Agron原版主题中，左侧栏仅支持显示固定头像。

以下为教程：

首先到WordPress管理页，再在“外观”的“主题文件编辑器”中，找到sidebar.php。

在文件中找到：

<div id="leftbar_overview_author_image" style="background-image: url(<?php echo get_option('argon_sidebar_auther_image') == '' ? 'data:image/svg+xml;base64,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' : get_option('argon_sidebar_auther_image'); ?>)" class="rounded-circle shadow-sm" alt="avatar"></div>

替换为：

<?php if ( is_user_logged_in() ) : ?>
	<div id="leftbar_overview_author_image" class="rounded-circle shadow-sm leftbar-user-avatar">
		<?php echo do_shortcode('[wpavatar]'); ?>
	</div>
<?php else : ?>
	<div id="leftbar_overview_author_image"
		 style="background-image: url(<?php echo get_option('argon_sidebar_auther_image') == '' ? 'data:image/svg+xml;base64,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' : get_option('argon_sidebar_auther_image'); ?>)"
		 class="rounded-circle shadow-sm"
		 alt="avatar"></div>
<?php endif; ?>

拉取的头像基于文派头像（WPAvatar）插件的[wpavatar]简码实现，使用前需安装WPAvatar，或将代码中的[wpavatar]简码用类似插件代替。该插件基于Cravatar，将WordPress默认的Gravatar头像源替换为Cravatar，相关内容可见如何设置头像。

因为简码输出的是 <img>，为让它填满圆形容器，需要在“额外CSS“中添加CSS代码。

CSS代码如下：

#leftbar_overview_author_image.leftbar-user-avatar{
    width: 100px;
    height: 100px;
    margin: auto;
    overflow: hidden;
    background: none !important;
    padding: 0;
}

#leftbar_overview_author_image.leftbar-user-avatar img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 50%;
}

至此，完成对原版主题改造，侧边栏应能显示当前登录用户头像