Description:
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if the php locales are setted for e.g. 'de_DE' or any language where 'decimal_point' is ',' the floats of 'width' and 'height' at 'ps_begin_page' are generated with the ',' which of course results in an invalid Postscript document.
I think this is a serious bug! 

Reproduce code:
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setlocale (LC_ALL, 'de_DE.ISO_8859-1');
// or
// setlocale (LC_NUMERIC, 'de_DE.ISO_8859-1');
$ps = ps_new();
ps_open_file(  $ps, "my_test_file.ps" );
ps_begin_page($ps, 612, 792);
ps_end_page( $ps );
ps_close(  $ps );

Expected result:
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Invalid Postscript document