Add $filter parameter for ReflectionClass::(getConstants|getReflectionConstants)

This solves [#79628](https://bugs.php.net/79628).

Similar to `ReflectionClass::getMethods()` and `ReflectionClass::getProperties()`,
this new `$filter` argument allows the filtering of constants defined in a class by
their visibility.

For that, we create three new constants for `ReflectionClassConstant`:

  * `IS_PUBLIC`
  * `IS_PROTECTED`
  * `IS_PRIVATE`

Closes GH-5649.

1 files changed, 2 insertions, 2 deletions

diff --git a/ext/reflection/php_reflection.stub.php b/ext/reflection/php_reflection.stub.php
index e3d3fee52c..49872137a4 100644
--- a/ext/reflection/php_reflection.stub.php
+++ b/ext/reflection/php_reflection.stub.php
@@ -263,10 +263,10 @@ class ReflectionClass implements Reflector
     public function hasConstant(string $name) {}
 
     /** @return array|null */
-    public function getConstants() {}
+    public function getConstants(int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE) {}
 
     /** @return ReflectionClassConstant[] */
-    public function getReflectionConstants() {}
+    public function getReflectionConstants(int $filter = ReflectionClassConstant::IS_PUBLIC | ReflectionClassConstant::IS_PROTECTED | ReflectionClassConstant::IS_PRIVATE) {}
 
     /** @return mixed */
     public function getConstant(string $name) {}