Using actions, hooks and filters in a non-WordPress page

It’s catch 22 – you need WordPress to use the hook system, but init will have already fired during load (wp-settings.php to be exact).

I would create a MU “Must Use” plugin (wp-content/mu-plugins/any-filename.php) for all your “outside of WordPress” functionality, with something like this at the start:

if ( ! defined( 'LOADED_EXTERNAL' ) || ! LOADED_EXTERNAL )
    return;

/**
 * Better technique for temporarily disabling a plugin on-the-fly.
 * 
 * @param   array   $plugins
 * @return  array
 */
function wpse_147541_active_plugins( $plugins ) {
    if ( $plugin = array_search( 'facetwp/index.php', $plugins ) )
        unset( $plugins[ $plugin ] );
    return $plugins;
}

add_filter( 'option_active_plugins', 'wpse_147541_active_plugins' );

// More awesome code!

And then in your external file:

define( 'LOADED_EXTERNAL', true );
require 'wp-load.php'; // No need for globalising variables, they'll all be in scope

The reason I advocate a MU plugin is that they run before regular plugins, so you’ll have time to intercept “FacetWP” (or any other plugins for that matter) from loading.

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