implode() in MDB_QueryTool - decimal-point -> comma

Hi I'm not sure if this has anything to do with QueryTool but in every case there is something wrong with implode() The symptom is that I can't insert floats because the decimal-points become commas in MDB/QueryTool/Query.php -> add(). var_dump shows me that my floats in the array have the correct type, but if the array is processed by implode() the decimal-points become commas in the resulting string. The strange thing is that implode(', ', $newData) does this incorrect transforming inside Query.php but _not_ if i test this in a simple script where implode() leaves the decimal-point untouched. What could be the problem? Why does implode() behave differently? I don't see the mistake. PHP 4.4.0 MDB 1.3.0 stable MDB_QueryTool 1.1.1 stable PEAR 1.4.6 stable Postgres 8.0.3 the DB-field is declared as decimal(5,2) thanks luk