Test static variable in parent trait method

Author: mvorisek

Zend/tests/static_variables_parent_trait_method.phpt

@@ -0,0 +1,45 @@
+--TEST--
+Behavior of static variables in parent trait method
+--FILE--
+<?php
+
+trait T {
+    public function foo()
+    {
+        var_dump(__CLASS__);
+
+        static $v = null;
+        if ($v === null) {
+            $v = random_bytes(64);
+        }
+        
+        return $v;
+    }
+}
+
+class A { use T; }
+class B extends A {}
+class C extends A { use T; }
+class D { use T; }
+
+$a = (new A())->foo();
+var_dump($a === (new A())->foo());
+var_dump($a === (new B())->foo());
+$c = new C();
+var_dump($a === $c->foo());
+var_dump($a === (new \ReflectionMethod(A::class, 'foo'))->invoke($c));
+var_dump($a === (new D())->foo());
+
+?>
+--EXPECT--
+string(1) "A"
+string(1) "A"
+bool(true)
+string(1) "A"
+bool(true)
+string(1) "C"
+bool(false)
+string(1) "A"
+bool(true)
+string(1) "D"
+bool(false)