NAME
	map_array - map an array over a function

SYNOPSIS
	 mixed *map_array(mixed *arr, string fun, object ob, mixed extra)

DESCRIPTION
	Returns an array holding the items of 'arr' mapped through ob->fun().
	The function 'fun' in 'ob' is called for each element in 'arr' with
	that element as parameter. A second parameter 'extra' is sent in each
	call if given. Principal function: 

	 foreach (index) arr[index] = ob->fun(arr[index],extra);

	The value returned by ob->fun(arr[.index.], extra) replaces the
	existing  element in the array.

SEE ALSO
	filter_array