Ciclare piu query

[Mr. PHP]

Come posso ciclare piu query senza che vadano in conflitto tra loro ??? Ho riportato il codice che utilizzo 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_each_category_id( $id );
			
		}

	}
		
	return $html;
	
}

function option_each_category_id( $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_each_category_id( $ID );
			
		}
		
	}

}