作为 WordPress 主题开发者,如果你的主题的某些功能需要借助某些插件才能实现,那你需要提醒主题使用者安装这些插件。在倡萌看来,最合理的提醒方法,就是启用主题后,在后台顶部提醒安装,如下图所示:
我们只需要借助 is_plugin_active() 函数来检测所需的插件是否已安装并启用,如果没有安装就进行提醒。
is_plugin_active() 函数简介
is_plugin_active() 函数是专门用来检测插件是否已经安装并启用的,使用的方法很简单,只需要添加对应的插件的主文件路径即可:
- if(!is_plugin_active( 'wordpress-popular-posts/wordpress-popular-posts.php' ))
- {
- echo '需要显示的内容';
- }
上面的代码的作用就是:如果没有启用 WordPress Popular Posts,就显示一段提醒文字。’wordpress-popular-posts/wordpress-popular-posts.php’ 就是 WordPress Popular Posts 插件的主文件的路径。
提示安装必要插件
只需要在主题的 functions.php 中添加类似代码,就可以达到本文配图的效果:
- add_action('admin_notices', 'showAdminMessages');
- function showAdminMessages()
- {
- $plugin_messages = array();
- include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
- // Download the Yoast WordPress SEO plugin
- if(!is_plugin_active( 'wordpress-seo/wp-seo.php' ))
- {
- $plugin_messages[] = 'This theme requires you to install the Yoast WordPress SEO plugin, <a href="http://wordpress.org/extend/plugins/wordpress-seo/" rel="external nofollow" >download it from here</a>.';
- }
- // Download the Disqus comment system
- if(!is_plugin_active( 'disqus-comment-system/disqus.php' ))
- {
- $plugin_messages[] = 'This theme requires you to install the Disqus comment system plugin, <a href="http://wordpress.org/extend/plugins/disqus-comment-system/" rel="external nofollow" >download it from here</a>.';
- }
- // Download the WordPress popular posts plugin
- if(!is_plugin_active( 'wordpress-popular-posts/wordpress-popular-posts.php' ))
- {
- $plugin_messages[] = 'This theme requires you to install the WordPress Popular Post plugin, <a href="http://wordpress.org/extend/plugins/wordpress-popular-posts/" rel="external nofollow" >download it from here</a>.';
- }
- if(count($plugin_messages) > 0)
- {
- echo '
- <div id="message" class="error">';
- foreach($plugin_messages as $message)
- {
- echo '
- <strong>'.$message.'</strong>
- ';
- }
- echo '</div>
- ';
- }
- }