Add silence operator outside fiber test

Author: trowski

Zend/tests/fibers/silence-operator.phpt renamed to Zend/tests/fibers/silence-operator-inside-fiber.phpt

@@ -23,6 +23,6 @@ trigger_error("Warning D", E_USER_WARNING);
 
 ?>
 --EXPECTF--
-Warning: Warning C in %ssilence-operator.php on line %d
+Warning: Warning C in %ssilence-operator-inside-fiber.php on line %d
 
-Warning: Warning D in %ssilence-operator.php on line %d
+Warning: Warning D in %ssilence-operator-inside-fiber.php on line %d

Zend/tests/fibers/silence-operator-outside-fiber.phpt

@@ -0,0 +1,28 @@
+--TEST--
+Silence operator does not leak into fiber
+--FILE--
+<?php
+
+$fiber = @new Fiber(function (): void {
+    trigger_error("Warning A", E_USER_WARNING);
+    Fiber::suspend();
+    trigger_error("Warning C", E_USER_WARNING);
+});
+
+@$fiber->start();
+
+trigger_error("Warning B", E_USER_WARNING);
+
+@$fiber->resume();
+
+trigger_error("Warning D", E_USER_WARNING);
+
+?>
+--EXPECTF--
+Warning: Warning A in %ssilence-operator-outside-fiber.php on line %d
+
+Warning: Warning B in %ssilence-operator-outside-fiber.php on line %d
+
+Warning: Warning C in %ssilence-operator-outside-fiber.php on line %d
+
+Warning: Warning D in %ssilence-operator-outside-fiber.php on line %d