Hide content unless ?access= in URL equals defined value (Conditions)

<?php

if( function_exists('oxygen_vsb_register_condition') ) {

global $oxy_condition_operators;

// Condition to check if a URL parameter is present.
oxygen_vsb_register_condition('Access Code', array('options'=>array(), 'custom'=>true), $oxy_condition_operators['string'], 'oxy_access_code_callback', 'Other');

function oxy_access_code_callback($value, $operator) {

if( $operator == '==') {

	if( !empty( $_GET['access'] ) && $_GET['access'] == $value ) {
	return true;
	} else {
	return false;
	}
	
} else if( $operator == '!=' ) {
	
	if( empty( $_GET['access'] ) || $_GET['access'] != $value ) {
		return true;
	} else {
		return false;
	}
	
}

}
	
}