werror()

Method zero_type()

Method zero_type

int zero_type(mixed a)

Description

Return the type of zero.

There are many types of zeros out there, or at least there are two. One is returned by normal functions, and one returned by mapping lookups and find_call_out when what you looked for wasn't there. The only way to separate these two kinds of zeros is zero_type.

Returns

When doing a find_call_out or mapping lookup, zero_type on this value will return 1 if there was no such thing present in the mapping, or if no such call_out could be found.

If the argument to zero_type is a destructed object or a function in a destructed object, 2 will be returned.

In all other cases zero_type will return 0 (zero).

See also

find_call_out