[phpa] caching of things like file() and xml_ routines

Hi-
    One of my scripts parses a big XML file on each invocation by doing 
something
like this:
    $data = join('', file($file,1));
    $parser = xml_parser_create();
    xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
    xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE,   1);
    xml_parse_into_struct($parser, $data, $vals, $index);
    xml_parser_free($parser);

I'm wondering if PHPA caches this sort of thing so that the xml struct is only
created when the underlying $file changes, or if it doesn't know about this and
reparses everything no matter what. 


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