When writing a WordPress plugin, it can sometimes be helpful to tell if another plugin is active or not, whether to prevent conflicts or to extend another plugin that you require as a dependency.
Fortunately, there’s a conditional function built into WordPress for just this task.
if ( is_plugin_active('the-plugin/the-plugin.php') ) {
//do stuff
}
The is_plugin_active() function accepts the relative path to the plugin (from the wp-content/plugins directory) as an argument, and returns either TRUE or FALSE.
