自定义 WordPress 默认评论头像
对于没有设置Gravatra头像的评论者来说,WordPress会显示一个你在后台设置的默认头像,可以是神秘人、空白、默认的Gravatar 标志等等。但是这些头像有一个共同的不足之处,就是不怎么美观,可看性不强!打个比方,如果你去一个博客阅读文章,但当你放心评论文章的读者头像都是小怪物、复古等一系列WordPress自动生成的“不堪入目”的头像时,你还有很浓的兴趣去阅读这个博客的文章吗?我想答案是肯定的!那么,你有没有想过,自己设计或找一个属于你博客、适合你博客的默认WordPress头像那?好了,周良就不吊大家的胃口了,让我来说一下如何不使用插件实现自定义WordPress默认评论头像的方法。
方法很简单,将下面我提供的这段代码放在你正在使用的主题functions.php文件中。
<?php // Make a new default gravatar available on the dashboard function newgravatar ($avatar_defaults) { $myavatar = get_bloginfo('template_directory') . '/images/tweaker.jpg'; $avatar_defaults[$myavatar] = "Tweaker"; return $avatar_defaults; } add_filter( 'avatar_defaults', 'newgravatar' ); ?>
上面代码中的/images/tweaker.jpg就是自定义默认头像的相对路径,你可以自行修改图片的地址。建议将头像放到你正在使用的主题images文件下面。
延迟加载 WordPress 评论头像
修改 HTML 结构
因为前面说到在新式浏览器中的问题, 我们不能再用一般书写 HTML 图片的方式, 而是要将占位符写到 src 属性, 而将真正的图片地址写在 data-original 属性上. 所以 WordPress 头像代码结构应该是下面这样的.
<img class="avatar lazy" src="/static/imghwm/default1.png" data-src="占位符图片.gif" data-original="头像图片.jpg" / alt="在WordPress中实现评论头像的自定义默认和延迟加载_PHP" >
在 WordPress 中, 本来输出头像如下.
<?php echo get_avatar($comment); ?>
现在需要改为适合 Lazy Load 插件的结构如下.
<?php echo '<img class="avatar lazy" src="/static/imghwm/default1.png" data-src="占位符图片.gif" alt="" data-original="' . preg_replace(array('/^.+(src=)(\"|\')/i', '/(\"|\')\sclass=(\"|\').+$/i'), array('', ''), get_avatar($comment)) . '" />'; ?>
这里建议使用 loading 图片或者默认头像作为占位符图片.
添加 Lazy Load 支持
打开 footer.php, 在

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