Fix compiler assumptions about self/etc wrt closures

* Don't throw an error if self/parent/static are used in a closure
  (outside a class).
* Don't propagate self:: constants into closures
* Use runtime fetch for self::class in closures

Fixes bug #66811.

1 files changed, 25 insertions, 0 deletions

diff --git a/Zend/tests/no_class_const_propagation_in_closures.phpt b/Zend/tests/no_class_const_propagation_in_closures.phpt
new file mode 100644
index 0000000000..e446573b9d
--- /dev/null
+++ b/Zend/tests/no_class_const_propagation_in_closures.phpt
@@ -0,0 +1,25 @@
+--TEST--
+self:: class constants should not be propagated into closures, due to scope rebinding
+--FILE--
+<?php
+
+class A {
+    const C = 'A::C';
+
+    public function f() {
+        return function() {
+            return self::C;
+        };
+    }
+}
+
+class B {
+    const C = 'B::C';
+}
+
+$f = (new A)->f();
+var_dump($f->bindTo(null, 'B')());
+
+?>
+--EXPECT--
+string(4) "B::C"