zoom problem

[temiz]

hello

my php-mapscript zoom function doesn't work properly.
Although "zoom-in" works normally,  "zoom-out"  does not  work.

$map->zoompoint($zoom_factor,$my_point,$map->width,$map->height,
                              $my_extent);

I checked zoom factor. When it is negative value, it does not make the
map smaller.
echo '$zoom_factor ',$zoom_factor;


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