Ciclare piu query

[Mr. PHP]

Come posso ciclare più query senza che vadano in conflitto tra loro ??? Questo e il codice che uso ma ovviamente e sbagliato....

function option_category_id(){
	
	global $html;
	
	$html = '';

	DB::select( '*', 'terms', 'parent="0"' );
	
	if( DB::$result && DB::num() > 0 ){
		
		while ( $obj = DB::obj() ) {
			
			$id = $obj->ID;
			$name = $obj->name;
			
			$html .= '<option value="'.$id.'">'.$name.'</option>';
			
			option_category_id_2( $id );
			
		}

	}
	
	return $html;
	
}

function option_category_id_2( $id ){
	
	global $html, $level;
	
	if( ! isset( $level ) )
		$level = '- ';
	else
		$level .= '- ';
	
	DB::select( '*', 'terms', 'parent="'.$id.'"' );
	
	if( DB::$result && DB::num() > 0 ){
		
		while ( $obj = DB::obj() ) {
			
			$id = $obj->ID;
			$name = $obj->name;
			
			$html .= '<option value="'.$id.'">'.$level.$name.'</option>';
			
			option_category_id_2( $id );
			
		}

	}

}