SYNOPSIS
        int closurep(mixed)

DESCRIPTION
        Returns 1 if the argument is a closure.

HISTORY
        Introduced in 3.2@70

SEE ALSO
        bytesp(E), clonep(E), coroutinep(E), floatp(E), intp(E), lpctypep(E),
        lwobjectp(E), mappingp(E), objectp(E), pointerp(E), referencep(E),
        stringp(E), structp(E), symbolp(E)