You might want to look at the routine that WP uses for this: locate_template(). It is in wp-includes/theme.php and is called from a number of functions in that file. Those functions are used by wp-includes/template-loader.php to select the correct type of template based on the current page and then walk up the theme hierarchy looking … Read more
Hm, I am not entirely sure about mechanics here. Usual is_plugin_active() checks if plugin is in active_plugins option. By this logic you could probably retrieve active_plugins of specific blog with get_blog_option() and check it for plugin.
Yes there is. But it is primarily meant for short interruptions (such as during upgrades) and not very user-friendly. WP creates .maintenance file in root (with timestamp info about time) to trigger it and removes after it is done. See WordPress Maintenance Mode Without a Plugin for reference. In practice using a plugin is usually … Read more
Ok – here is a method – thanks to @Rarst for pointing me in the right direction. Include the require file if the plugins_api function is not found: if ( ! function_exists( ‘plugins_api’ ) ) { require_once( ABSPATH . ‘wp-admin/includes/plugin-install.php’ ); } Then, prepare a query to pass to plugins_api(): // set the arguments to … Read more
There is a filter you can use, but it is well hidden. Take a look at the WordPress function __. As you can see it calls another function, translate. And there it is, a filter called gettext. You can use it to intercept any (translated) text that is run through __. Basically, what you do … Read more
Experiencing plugin incompatibilies isn’t something I can relate to very well as that is something I’ve only faced a handful of times over the past years. On those few occasions that I’ve needed to build a site using multiple plugins I’ve prioritized using plugins from same authors. For example WooCommerce and its official addons. I’ve … Read more
I was able to make it work by adding these two lines to my theme’s functions.php file: add_filter( ‘widget_text’, ‘shortcode_unautop’); add_filter( ‘widget_text’, ‘do_shortcode’); The Custom HTML Widget now correctly executes the shortcode function and outputs the result.
Please read through the following: http://codex.wordpress.org/License http://wordpress.org/about/license/ http://en.wikipedia.org/wiki/GPL http://www.gnu.org/licenses/gpl.html You can’t can sell it as software or development, although and/or you can also charge for maintanance and install. Anyway, you should at least donate to the plugin developers, if you make money with their work somehow. EDIT I’m am sorry for my previous lines: I … Read more
Install plugin in networ admin as usual for multisite. Do not activate plugin for whole network. Go to admin of individual site and enable plugin there for that site alone.
I was inspired by your question to create a plugin that I’ve been kicking the can on for several months. I’m calling it Deprecation Checker. By default, it scans the plugin and theme directories (recursively) to find deprecated functions. The functions list is sourced directly from the WP deprecated files. It then outputs a nice … Read more