This was taken from the WordPress Codex reference for is_plugin_active
In the Admin Area:
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is_plugin_active($plugin); |
In the front end of a theme you need to include a reference to the following library
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include_once( ABSPATH . 'wp-admin/includes/plugin.php' ); is_plugin_active($plugin); |
In this case $plugin is the directory of the plugin followed by the main php file. In this example below the event Event Espresso plugin directory is used.
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$plugin = event-espresso/espresso.php |