Wrapping functions with a class to isolate private functions

class-wrapping.php

<?php
/**
 * Wrapping with a class the static way:
 */
Static_Convio_Gravity_Forms_Meta::init();

class Static_Convio_Gravity_Forms_Meta {

	public static function init() {
		add_action( 'gform_post_update_form_meta', array( __CLASS__, 'pga_gform_post_update_form_meta' ), 10, 3 );
	}

	public static function pga_gform_post_update_form_meta( $form_meta, $form_id, $meta_name ) {
		// Call to helper function
		$hidden_ints = self::hidden_ints( $post_data );
	}

	private static function hidden_ints( $post_data ) {
		$hidden_ints = array( 0, 1 );
		return $hidden_ints;
	}
}


/**
 * Wrapping with a class the object way:
 */
new Object_Convio_Gravity_Forms_Meta();

class Object_Convio_Gravity_Forms_Meta {

	public function __construct() {
		add_action( 'gform_post_update_form_meta', array( $this, 'pga_gform_post_update_form_meta' ), 10, 3 );
	}

	public function pga_gform_post_update_form_meta( $form_meta, $form_id, $meta_name ) {
		// Call to helper function
		$hidden_ints = $this->hidden_ints( $post_data );
	}

	private function hidden_ints( $post_data ) {
		$hidden_ints = array( 0, 1 );
		return $hidden_ints;
	}
}