NAME
	map_mapping - map a mapping over a function

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

DESCRIPTION
	Map_mapping calls the function fun with every value in the mapping
	m as argument and constructs a new mapping the the return values
	from the function as values. If the optional extra argument is
	present it will be sent to the function as well as a second argument.

SEE ALSO
	filter_mapping,map_array,filter_array