NAME
	filter_array - filter an array through a seive

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

	Returns an array holding the items of 'arr' filtered 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. If ob->fun(arr[.index.], extra)
	returns 1 the element is included in the returned array. 

SEE ALSO
	map_array