filter_mapping

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          filter_mapping() - remove some elements of a mapping based
          on a function

     SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
          mapping filter_mapping( mapping map, string fun, object ob,
                                    mixed extra, ... );
          mapping map_mapping( mapping map, function f, mixed extra, ... );

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          Returns an mapping with the same keys as map whose items
          have been mapped throught 'ob->fun()' or 'f'.  The function
          is called for each element in 'arr' and the return value is
          put back in that spot in after the item.

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          filter_array(3), sort_array(3), map(3)

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