Basic CiviCRM Modification

civicrm-modifier.php

<?php /* 
--------------------------------------------------------------------------------
Plugin Name: CiviCRM Modifier
Plugin URI: http://haystack.co.uk
Description: Custom code to modify CiviCRM's behaviour in a multisite context
Author: Christian Wach
Version: 0.1
Author URI: http://haystack.co.uk
--------------------------------------------------------------------------------
*/



/**
 * Class definition
 */

class CiviCRM_Modifier {
	
	
	
	/** 
	 * Initialises this object
	 */
	function __construct() {
	
		// late load Civi so we can prevent it if we want to
		// NOTE: this may need to go in wp-config.php - here may be too late
		if ( ! defined( 'CIVICRM_LATE_LOAD' ) ) {
			define( 'CIVICRM_LATE_LOAD', 9 );
		}

		// add actions for plugin init on CiviCRM init
		add_action( 'civicrm_instance_loaded', array( $this, 'register_civi_hooks' ) );
		
		// hooked in with a lower priority so it runs before the CiviCRM action is fired
		add_action( 'plugins_loaded', array( $this, 'civicrm_only_on_main_site_please' ), 8 );

	}
	
	
	
	/**
	 * Register hooks on CiviCRM plugin init
	 * 
	 * @return void
	 */
	public function register_civi_hooks() {
		
		// kill CiviCRM shortcode button
		add_action( 'admin_head', array( $this, 'kill_civi_button' ) );
		
	}
	
	
	
	/** 
	 * Do not load the CiviCRM shortcode button unless we explicitly enable it
	 * 
	 * @return void
	 */
	public function kill_civi_button() {
		
		// get screen
		$screen = get_current_screen();
		
		// is this a post type we want to allow the button on?
		if ( $screen->post_type != 'page' ) {
			
			// remove Civi's actions from all but pages
			remove_action( 'media_buttons_context', array( civi_wp(), 'add_form_button' ) );
			remove_action( 'media_buttons', array( civi_wp(), 'add_form_button' ), 100 );
			remove_action( 'admin_enqueue_scripts', array( civi_wp(), 'add_form_button_js' ) );
			remove_action( 'admin_footer', array( civi_wp(), 'add_form_button_html' ) );
			
		}
		
	}
	
	
	
	/** 
	 * Do not load the CiviCRM on sites other than the main site
	 * 
	 * @return void
	 */
	public function civicrm_only_on_main_site_please() {
		
		// if not on main site
		if ( is_multisite() AND ! is_main_site() ) {
			
			// Uncomment the following to prevent Civi from loading at all
			//remove_action( 'plugins_loaded', 'civi_wp', 9 );

			// unhook menu item, but allow Civi to load
			remove_action( 'admin_menu', array( civi_wp(), 'add_menu_items' ) );
			
		}
		
	}
	
	
	
} // class ends



// init plugin
global $civicrm_modifier;
$civicrm_modifier = new CiviCRM_Modifier;