Display line-numbers of funktion calls?

Hi, does anyone know a way to get the file and line number of a function call within the called function? I use a self-written class for database-abstraction (for easily changing the databse-type) and when i get a sql-error, the scripts are only displaying the line number of the include-file with the class, wich complicates debugging quite much. Thanks, Thomas 'Neo' Weber --- thomas@youngarts.org neo@gothic-chat.de