NAME
filter_mapping - filter a mapping over a function

SYNOPSIS
mapping filter_mapping(mapping m,string fun,object o,mixed extra)

DESCRIPTION
Filter_mapping calls the function fun with every value in the mapping m as argument. If the function returns zero that value will be excluded from the restulting mapping, otherwise it will be included. If the optional extra argument is present that is also sent to the function as a second argumet.

SEE ALSO
map_mapping, map_array, filter_array