This should speed up `Uuid::fromString()` massively, leading to much shallower execution
paths when `toString()` and similar simplistic API is required.
As documented in https://wiki.php.net/rfc/use_global_elements, the engine (by default) does a local namespace
lookup, then falls back to global namespace when first calling a global function referenced in namespaced code,
unless that function is referenced via fully qualified name (FQN).
By using the FQN, the actual symbol can be looked up at compile-time, both by the PHP engine and by static analysis
tooling, allowing for compiler (in particular) optimizations to replace known hot-path functions with specialized opcodes.
Sadly, no actual benchmark at hand: the improvements can be minimal or massive, depending on where this library is
used (tight loops being most relevant).
* Maintain backwards compatibility with the former Uuid::isValid() and
Uuid::VALID_PATTERN
* Remove the assert statements in favor of str_replace and preg_match
* Make the validator a featureset of the factory
* Remove old suggestion about locations of constants
* Remove argument count assertions
* Remove VALID_PATTERN from Uuid
Marco Pivetta
Ben Ramsey
Bradyn Poulsen