Removes the CiviCRM 5.12.x menu from the front-end in WordPress

civicrm-remove-kam.php

<?php /*
--------------------------------------------------------------------------------
Plugin Name: CiviCRM Remove KAM
Description: Removes CiviCRM's menu on the front-end.
Author: Christian Wach
Version: 0.1
Author URI: http://haystack.co.uk
Depends: CiviCRM
--------------------------------------------------------------------------------
*/


/**
 * CiviCRM Remove KAM class.
 *
 * A class for encapsulating plugin functionality.
 *
 * @since 0.1
 */
class CiviCRM_Remove_KAM {

	/**
	 * Initialise this object.
	 *
	 * @since 0.1
	 */
	public function __construct() {

		// Bail if CiviCRM plugin is not present.
		if ( ! function_exists( 'civi_wp' ) ) return;

		// Finally, register hooks.
		$this->register_hooks();

	}

	/**
	 * Check if CiviCRM is initialised.
	 *
	 * @since 0.1
	 *
	 * @return bool True if CiviCRM initialised, false otherwise.
	 */
	public function is_civicrm_initialised() {

		// Init only when CiviCRM is fully installed.
		if ( ! defined( 'CIVICRM_INSTALLED' ) ) return false;
		if ( ! CIVICRM_INSTALLED ) return false;

		// Bail if no CiviCRM init function.
		if ( ! function_exists( 'civi_wp' ) ) return false;

		// Try and initialise CiviCRM.
		return civi_wp()->initialize();

	}

	/**
	 * Register hooks.
	 *
	 * @since 0.1
	 */
	public function register_hooks() {

		// Hook in just before CiviCRM.
		add_action( 'wp_head', array( $this, 'resources_disable' ), 9 );

	}

	/**
	 * Disable CiviCRM resources from front-end.
	 *
	 * @since 0.1
	 */
	public function resources_disable() {

		// Kick out if no CiviCRM.
		if ( ! $this->is_civicrm_initialised() ) return;

		// Only on front-end.
		if ( ! is_admin() ) {

			// Define resources to disable.
			$remove = array(
				'bower_components/smartmenus/dist/jquery.smartmenus.min.js',
				'bower_components/smartmenus/dist/addons/keyboard/jquery.smartmenus.keyboard.min.js',
				'js/crm.menubar.js',
				'bower_components/smartmenus/dist/css/sm-core-css.css',
				'css/crm-menubar.css',
				'css/menubar-wordpress.css',
			);

			// Disable KAM resources.
			foreach( $remove AS $item ) {
				$this->resource_disable( 'civicrm', $item );
			}

		}

	}

	/**
	 * Disable a resource enqueued by CiviCRM.
	 *
	 * @since 0.1
	 *
	 * @param str $extension The name of the extension e.g. 'org.civicrm.shoreditch'. Default is CiviCRM core.
	 * @param str $file The relative path to the resource. Default is CiviCRM core stylesheet.
	 */
	public function resource_disable( $extension = 'civicrm', $file = 'css/civicrm.css' ) {

		// Kick out if no CiviCRM.
		if ( ! $this->is_civicrm_initialised() ) return;

		// Get the resource URL.
		$url = $this->resource_get_url( $extension, $file );

		// Kick out if not enqueued.
		if ( $url === false ) return;

		// Set to disabled.
		CRM_Core_Region::instance( 'html-header' )->update( $url, array( 'disabled' => TRUE ) );

	}

	/**
	 * Get the URL of a resource if it is enqueued by CiviCRM.
	 *
	 * @since 0.1
	 *
	 * @param str $extension The name of the extension e.g. 'org.civicrm.shoreditch'. Default is CiviCRM core.
	 * @param str $file The relative path to the resource. Default is CiviCRM core stylesheet.
	 * @return bool|str $url The URL if the resource is enqueued, false otherwise.
	 */
	public function resource_get_url( $extension = 'civicrm', $file = 'css/civicrm.css' ) {

		// Kick out if no CiviCRM.
		if ( ! $this->is_civicrm_initialised() ) return false;

		// Get registered URL.
		$url = CRM_Core_Resources::singleton()->getUrl( $extension, $file, TRUE );

		// Get registration data from region.
		$registration = CRM_Core_Region::instance( 'html-header' )->get( $url );

		// Bail if not registered.
		if ( empty( $registration ) ) return false;

		// Is enqueued.
		return $url;

	}

} // Class ends.



/**
 * Get a reference to this plugin.
 *
 * @since 0.1
 *
 * @return CiviCRM_Remove_KAM $civicrm_remove_kam The plugin reference.
 */
function civicrm_remove_kam() {

	// Hold the plugin instance in a static variable.
	static $civicrm_remove_kam = false;

	// Instantiate plugin if not yet instantiated.
	if ( false === $civicrm_remove_kam ) {
		$civicrm_remove_kam = new CiviCRM_Remove_KAM();
	}

	// --<
	return $civicrm_remove_kam;

}

// Init plugin.
add_action( 'plugins_loaded', 'civicrm_remove_kam' );