adding points to shapefile

[Stepan Kafka]

Can anybody help me?

I am trying to add points to existing shapefile via PHP mapscript module:
When I create a new shapefile with

    $myFile = ms_newShapeFileObj( $myFileName, MS_SHP_POINT);

and then add point, everything is OK, but when I reopen this shapefile with

    $myFile = ms_newShapeFileObj( $myFileName, -1);

and try to add a new point the same way, nothing adds here. Where is the
mistake, please?

Thank you

Stepan Kafka
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