如何自动提醒WordPress主题使用者安装必要插件

本文目录
[隐藏]

• 1is_plugin_active() 函数简介
• 2提示安装必要插件

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：

在 如何在WordPress后台顶部添加错误提醒信息或升级提醒信息 中已经介绍了通过 admin_notices 挂钩 显示提醒信息的方法，那么接我们只需要借助 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：

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if(!is_plugin_active( 'wordpress-popular-posts/wordpress-popular-posts.php' ))
	{
	echo '需要显示的内容';
	}

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：

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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/">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/">download it from here</a>.';
	}
	// Download the WordPress popular posts plugin
	if(!is_plugin_active( 'wordpress-popular-posts/wordpress-popular-posts.php' ))
	{
		$plugin_messages[] = 'This theme requires you to install the WordPress Popular Post plugin, <a href="http://wordpress.org/extend/plugins/wordpress-popular-posts/">download it from here</a>.';
	}
	if(count($plugin_messages) > 0)
	{
		echo '
<div id="message" class="error">';
			foreach($plugin_messages as $message)
			{
				echo '
<strong>'.$message.'</strong>
';
			}
		echo '</div>
';
	}
}

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/”>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/”>download it from here</a>.’; } // Download the WordPress popular posts plugin if(!is_plugin_active( ‘wordpress-popular-posts/wordpress-popular-posts.php’ )) { $plugin_messages[] = ‘This theme requires you to install the WordPress Popular Post plugin, <a href=”http://wordpress.org/extend/plugins/wordpress-popular-posts/”>download it from here</a>.’; } if(count($plugin_messages) > 0) { echo ‘ <div id=”message” class=”error”>’; foreach($plugin_messages as $message) { echo ‘ <strong>’.$message.'</strong> ‘; } echo ‘</div> ‘; } }