Provide MarketPress coupon based on Membership level

Provide MarketPress coupon based on Membership level.php

add_filter( 'mp_coupon_value', 'mp_coupon_value_cb', 10, 3 );
function mp_coupon_value_cb( $return, $code, $total ) {
	
	$arr = array(
		     'XXX' => 1,
		     'YYY' => 2
		     );
	
	if( current_user_on_level( $arr[$code] ) ){
		return $return;
	}else{
		global $mp;
		$currency = $mp->get_setting('currency', 'USD');
		$symbol = $mp->currencies[$currency][1];
		$symbols = explode(', ', $symbol);
		if (is_array($symbols)) {
		       $symbol = "";
		       foreach ($symbols as $temp) {
			       $symbol .= '&#x'.$temp.';';
		       }
		} else {
		       $symbol = '&#x'.$symbol.';';
		}
		
		$del = explode( $symbol, $return['discount'] );
		
		$return['new_total'] = $return['new_total'] + $del[1];
		$return['discount'] = 0;
		
		return $return;
	}
}