How to access function from outside of a class within this class in WP plugin?

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I am developing a WP plugin called e.g. DD_Awesome_Plugin and this is my code so far (simplified version without additional code logic within class functions): 

class DD_Awesome_PLugin {

    public function __construct()
    {

    }

    public function add_menu_page()
    {
        add_options_page('DD Awesome PLugin', 'DD Awesome PLugin', 'administrator', __FILE__, array('DD_Awesome_PLugin', 'display_options_page'));
    }

    public function display_options_page()
    {
        $plugin_options = get_option('dd_my_awesome_plugin');
        echo "Here we go admin!";

        /* and after echo I need to triger a function "trigger_me_from_class()" that is located outside of the class. */
    }

}


add_action('admin_menu', function() {
    DD_Awesome_PLugin::add_menu_page();
});

add_action('admin_init', function() {
    new DD_Awesome_PLugin();
    include_once dirname(__FILE__) . ('/simple_html_dom.php');
});


 /* just trigger this function "trigger_me_from_class" from "display_options_page" function (situated in DD_Awesome_plugin class above) */
public function trigger_me_from_class()
{
    $str = date('Y-m-d H:i:s', time());
    wp_mail('info@example.com', 'DD success message', "Success at $str." );
}
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1 comment

  1. Create a static getter for your class instance:

    class DD_Awesome_Plugin
{
    /**
     * Plugin main instance.
     *
     * @type object
     */
    protected static $instance = NULL;

    /**
     * Access plugin instance. You can create further instances by calling
     * the constructor directly.
     *
     * @wp-hook wp_loaded
     * @return  object T5_Spam_Block
     */
    public static function get_instance()
    {
        if ( NULL === self::$instance )
            self::$instance = new self;

        return self::$instance;
    }

    public function add_menu_page()
    {
        add_options_page(
            'DD Awesome PLugin', 
            'DD Awesome PLugin', 
            'administrator', 
            __FILE__, 
            array( $this, 'display_options_page' )
        );
    }
}

    And now you get the plugin instance with:

    add_action('admin_menu', function() {
    DD_Awesome_Plugin::get_instance()->add_menu_page();
});

    Or:

    add_action( 
    'admin_menu', 
    array( DD_Awesome_Plugin::get_instance(), 'add_menu_page' ) 
);

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