SplPriorityQueue::valid
Introduction
Other Basic Extensions
PHP Manual

# SPL Type Handling

- Introduction
- SplInt — The SplInt class
  - SplInt::__construct — Constructs an integer object type
- SplFloat — The SplFloat class
  - SplFloat::__construct — Constructs a float object type
- SplEnum — The SplEnum class
  - SplEnum::__construct — Constructs an enumeger object type
- SplBool — The SplBool class
  - SplBool::__construct — Constructs a bool object type

SplPriorityQueue::valid
Introduction
Other Basic Extensions
PHP Manual