bool(true)
bool(true)
bool(true)
bool(false)
Traversable Array 
array(0) {
}
KeyedTraversable Array 
array(0) {
}
Indexish Array 
array(0) {
}
HipHop Fatal error: Argument 1 passed to ifoo() must be an instance of IFoo, array given in %s on line %d