diff --git a/ext/zend_test/tests/observer_backtrace_01.phpt b/ext/zend_test/tests/observer_backtrace_01.phpt
index 7f021bf402515..147d30db88a05 100644
--- a/ext/zend_test/tests/observer_backtrace_01.phpt
+++ b/ext/zend_test/tests/observer_backtrace_01.phpt
@@ -6,6 +6,7 @@ zend_test
 zend_test.observer.enabled=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_init_backtrace=1
+zend_test.observer.show_output=1
 --FILE--
 <?php
 class TestClass
diff --git a/ext/zend_test/tests/observer_basic_01.phpt b/ext/zend_test/tests/observer_basic_01.phpt
index b208ae2341e85..435a46c8407ec 100644
--- a/ext/zend_test/tests/observer_basic_01.phpt
+++ b/ext/zend_test/tests/observer_basic_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic observability of userland functions
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_basic_02.phpt b/ext/zend_test/tests/observer_basic_02.phpt
index ac61a8b18e723..ad79ac31f0e4d 100644
--- a/ext/zend_test/tests/observer_basic_02.phpt
+++ b/ext/zend_test/tests/observer_basic_02.phpt
@@ -4,6 +4,7 @@ Observer: Basic observability of userland methods
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_basic_03.phpt b/ext/zend_test/tests/observer_basic_03.phpt
index f98390a0c986a..3d60550ce6050 100644
--- a/ext/zend_test/tests/observer_basic_03.phpt
+++ b/ext/zend_test/tests/observer_basic_03.phpt
@@ -4,6 +4,7 @@ Observer: Basic observability of includes
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_basic_04.phpt b/ext/zend_test/tests/observer_basic_04.phpt
index 1b55f6da3d272..1fca32a987071 100644
--- a/ext/zend_test/tests/observer_basic_04.phpt
+++ b/ext/zend_test/tests/observer_basic_04.phpt
@@ -4,6 +4,8 @@ Observer: Basic observability of includes only (no functions)
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.observe_includes=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_basic_05.phpt b/ext/zend_test/tests/observer_basic_05.phpt
index 1891cd87ae49b..fa50c25b652de 100644
--- a/ext/zend_test/tests/observer_basic_05.phpt
+++ b/ext/zend_test/tests/observer_basic_05.phpt
@@ -4,6 +4,8 @@ Observer: Basic observability of functions only (no includes)
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.observe_functions=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_basic_06.phpt b/ext/zend_test/tests/observer_basic_06.phpt
index d27c340db1980..b4b8a7e540c92 100644
--- a/ext/zend_test/tests/observer_basic_06.phpt
+++ b/ext/zend_test/tests/observer_basic_06.phpt
@@ -4,6 +4,8 @@ Observer: Basic observability of functions only (with run-time swapping)
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.observe_function_names=foo
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_bug81430_1.phpt b/ext/zend_test/tests/observer_bug81430_1.phpt
index 34ac119e54444..aedfc09ed2495 100644
--- a/ext/zend_test/tests/observer_bug81430_1.phpt
+++ b/ext/zend_test/tests/observer_bug81430_1.phpt
@@ -5,6 +5,7 @@ zend_test
 --INI--
 memory_limit=20M
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_bug81430_2.phpt b/ext/zend_test/tests/observer_bug81430_2.phpt
index dc4d29e3e3828..11a9f061b3d40 100644
--- a/ext/zend_test/tests/observer_bug81430_2.phpt
+++ b/ext/zend_test/tests/observer_bug81430_2.phpt
@@ -5,6 +5,7 @@ zend_test
 --INI--
 memory_limit=20M
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --SKIPIF--
 <?php
diff --git a/ext/zend_test/tests/observer_bug81435.phpt b/ext/zend_test/tests/observer_bug81435.phpt
index 9007575c54531..ceec29ba0bcaa 100644
--- a/ext/zend_test/tests/observer_bug81435.phpt
+++ b/ext/zend_test/tests/observer_bug81435.phpt
@@ -5,6 +5,8 @@ zend_test
 --INI--
 memory_limit=20M
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.observe_function_names=a,d
 opcache.optimization_level=0
 --SKIPIF--
diff --git a/ext/zend_test/tests/observer_call_user_func_01.phpt b/ext/zend_test/tests/observer_call_user_func_01.phpt
index f4a25a0372310..8e40f44c2ecd2 100644
--- a/ext/zend_test/tests/observer_call_user_func_01.phpt
+++ b/ext/zend_test/tests/observer_call_user_func_01.phpt
@@ -4,6 +4,7 @@ Observer: call_user_func() from root namespace
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_call_user_func_02.phpt b/ext/zend_test/tests/observer_call_user_func_02.phpt
index 30a4b08f3fc03..958348b151db0 100644
--- a/ext/zend_test/tests/observer_call_user_func_02.phpt
+++ b/ext/zend_test/tests/observer_call_user_func_02.phpt
@@ -4,6 +4,7 @@ Observer: call_user_func_array() from root namespace
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_call_user_func_03.phpt b/ext/zend_test/tests/observer_call_user_func_03.phpt
index 4eef414747d0c..5e1932bc57039 100644
--- a/ext/zend_test/tests/observer_call_user_func_03.phpt
+++ b/ext/zend_test/tests/observer_call_user_func_03.phpt
@@ -4,6 +4,7 @@ Observer: call_user_func() from namespace
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_call_user_func_04.phpt b/ext/zend_test/tests/observer_call_user_func_04.phpt
index 97921a70df7bd..679a82407ce05 100644
--- a/ext/zend_test/tests/observer_call_user_func_04.phpt
+++ b/ext/zend_test/tests/observer_call_user_func_04.phpt
@@ -4,6 +4,7 @@ Observer: call_user_func_array() from namespace
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_closure_01.phpt b/ext/zend_test/tests/observer_closure_01.phpt
index 2778d277225b1..bee5c5e34afa5 100644
--- a/ext/zend_test/tests/observer_closure_01.phpt
+++ b/ext/zend_test/tests/observer_closure_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic observability of closures
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_closure_02.phpt b/ext/zend_test/tests/observer_closure_02.phpt
index ce75ccd12e071..59acf49380409 100644
--- a/ext/zend_test/tests/observer_closure_02.phpt
+++ b/ext/zend_test/tests/observer_closure_02.phpt
@@ -4,6 +4,7 @@ Observer: Observability of fake closures
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_declarations_01.phpt b/ext/zend_test/tests/observer_declarations_01.phpt
index 6d91834ef9fb2..c03d72ed09401 100644
--- a/ext/zend_test/tests/observer_declarations_01.phpt
+++ b/ext/zend_test/tests/observer_declarations_01.phpt
@@ -4,6 +4,7 @@ Observer: Observe function and class declarations
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.observe_declaring=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_declarations_file_cache.phpt b/ext/zend_test/tests/observer_declarations_file_cache.phpt
index df20e359c0e58..8940474baa2b2 100644
--- a/ext/zend_test/tests/observer_declarations_file_cache.phpt
+++ b/ext/zend_test/tests/observer_declarations_file_cache.phpt
@@ -4,6 +4,8 @@ Observer: Observe function and class declarations with file_cache_only
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.observe_declaring=1
 opcache.enable_cli=1
 opcache.file_cache={TMP}
diff --git a/ext/zend_test/tests/observer_error_01.phpt b/ext/zend_test/tests/observer_error_01.phpt
index 971080089c10d..d20a23b00b293 100644
--- a/ext/zend_test/tests/observer_error_01.phpt
+++ b/ext/zend_test/tests/observer_error_01.phpt
@@ -4,6 +4,7 @@ Observer: End handlers fire after a fatal error
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 memory_limit=2M
diff --git a/ext/zend_test/tests/observer_error_02.phpt b/ext/zend_test/tests/observer_error_02.phpt
index 58b2d5ea80ef4..f1c1500135b44 100644
--- a/ext/zend_test/tests/observer_error_02.phpt
+++ b/ext/zend_test/tests/observer_error_02.phpt
@@ -4,6 +4,7 @@ Observer: End handlers fire after a userland fatal error
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_error_03.phpt b/ext/zend_test/tests/observer_error_03.phpt
index b9f5ae75cc0d9..4289d86089a15 100644
--- a/ext/zend_test/tests/observer_error_03.phpt
+++ b/ext/zend_test/tests/observer_error_03.phpt
@@ -4,6 +4,7 @@ Observer: non-fatal errors do not fire end handlers prematurely
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_error_04.phpt b/ext/zend_test/tests/observer_error_04.phpt
index f8c68ebeedaad..bb3ee1013ec47 100644
--- a/ext/zend_test/tests/observer_error_04.phpt
+++ b/ext/zend_test/tests/observer_error_04.phpt
@@ -5,6 +5,7 @@ zend_test
 soap
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_error_05.phpt b/ext/zend_test/tests/observer_error_05.phpt
index 9debfc2b0ad27..2405fcb25423c 100644
--- a/ext/zend_test/tests/observer_error_05.phpt
+++ b/ext/zend_test/tests/observer_error_05.phpt
@@ -4,6 +4,7 @@ Observer: End handlers fire after a userland fatal error
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_eval_01.phpt b/ext/zend_test/tests/observer_eval_01.phpt
index 7f9ff53acba11..2b63c752d3c8e 100644
--- a/ext/zend_test/tests/observer_eval_01.phpt
+++ b/ext/zend_test/tests/observer_eval_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic eval observability
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_exception_01.phpt b/ext/zend_test/tests/observer_exception_01.phpt
index 2c296991e402f..e40d76fae91e0 100644
--- a/ext/zend_test/tests/observer_exception_01.phpt
+++ b/ext/zend_test/tests/observer_exception_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic observability of userland functions with uncaught exceptions
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_01.phpt b/ext/zend_test/tests/observer_fiber_01.phpt
index a70df36b0bbcd..13bb4d91cd35b 100644
--- a/ext/zend_test/tests/observer_fiber_01.phpt
+++ b/ext/zend_test/tests/observer_fiber_01.phpt
@@ -4,6 +4,8 @@ Observer: Basic fiber switching
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_init=1
 zend_test.observer.fiber_switch=1
 zend_test.observer.fiber_destroy=1
diff --git a/ext/zend_test/tests/observer_fiber_02.phpt b/ext/zend_test/tests/observer_fiber_02.phpt
index 34fe42c10f203..45d97418d92fa 100644
--- a/ext/zend_test/tests/observer_fiber_02.phpt
+++ b/ext/zend_test/tests/observer_fiber_02.phpt
@@ -4,6 +4,8 @@ Observer: Unfinished fiber
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_switch=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_03.phpt b/ext/zend_test/tests/observer_fiber_03.phpt
index d55e8d9e84c90..5ab1e3192f3da 100644
--- a/ext/zend_test/tests/observer_fiber_03.phpt
+++ b/ext/zend_test/tests/observer_fiber_03.phpt
@@ -4,6 +4,8 @@ Observer: Nested fibers
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_switch=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_04.phpt b/ext/zend_test/tests/observer_fiber_04.phpt
index 29e1b2d086851..b2e1147163ad5 100644
--- a/ext/zend_test/tests/observer_fiber_04.phpt
+++ b/ext/zend_test/tests/observer_fiber_04.phpt
@@ -4,6 +4,8 @@ Observer: Nested fibers with unfinished fiber
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_switch=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_05.phpt b/ext/zend_test/tests/observer_fiber_05.phpt
index ce589033f97f5..00111ffe1569e 100644
--- a/ext/zend_test/tests/observer_fiber_05.phpt
+++ b/ext/zend_test/tests/observer_fiber_05.phpt
@@ -4,6 +4,8 @@ Observer: Nested fibers with both unfinished
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_switch=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_06.phpt b/ext/zend_test/tests/observer_fiber_06.phpt
index 7176336c5ffac..1abb538ee8972 100644
--- a/ext/zend_test/tests/observer_fiber_06.phpt
+++ b/ext/zend_test/tests/observer_fiber_06.phpt
@@ -4,6 +4,8 @@ Observer: Throwing fiber
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_all=0
 zend_test.observer.fiber_switch=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_fiber_functions_01.phpt b/ext/zend_test/tests/observer_fiber_functions_01.phpt
index d3d395bd302fc..61c27a783ed49 100644
--- a/ext/zend_test/tests/observer_fiber_functions_01.phpt
+++ b/ext/zend_test/tests/observer_fiber_functions_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic function observing in fibers
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.fiber_init=1
 zend_test.observer.fiber_switch=1
diff --git a/ext/zend_test/tests/observer_fiber_functions_02.phpt b/ext/zend_test/tests/observer_fiber_functions_02.phpt
index c2b7eb007fae7..7d3df3a43e211 100644
--- a/ext/zend_test/tests/observer_fiber_functions_02.phpt
+++ b/ext/zend_test/tests/observer_fiber_functions_02.phpt
@@ -4,6 +4,7 @@ Observer: Function observing in fibers with unfinished fiber
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.fiber_init=1
 zend_test.observer.fiber_switch=1
diff --git a/ext/zend_test/tests/observer_fiber_functions_03.phpt b/ext/zend_test/tests/observer_fiber_functions_03.phpt
index d96390068a2f5..3468120ef4b58 100644
--- a/ext/zend_test/tests/observer_fiber_functions_03.phpt
+++ b/ext/zend_test/tests/observer_fiber_functions_03.phpt
@@ -4,6 +4,7 @@ Observer: Function observing in fibers with bailout in fiber
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.fiber_init=1
 zend_test.observer.fiber_switch=1
diff --git a/ext/zend_test/tests/observer_generator_01.phpt b/ext/zend_test/tests/observer_generator_01.phpt
index f7170aad3388c..46e0a9fabc0df 100644
--- a/ext/zend_test/tests/observer_generator_01.phpt
+++ b/ext/zend_test/tests/observer_generator_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic generator observability
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_generator_02.phpt b/ext/zend_test/tests/observer_generator_02.phpt
index 08c0992e442be..e008d20993ac8 100644
--- a/ext/zend_test/tests/observer_generator_02.phpt
+++ b/ext/zend_test/tests/observer_generator_02.phpt
@@ -4,6 +4,7 @@ Observer: Generator with explicit return
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_generator_03.phpt b/ext/zend_test/tests/observer_generator_03.phpt
index 9022cd3345605..4c6bd8935af9c 100644
--- a/ext/zend_test/tests/observer_generator_03.phpt
+++ b/ext/zend_test/tests/observer_generator_03.phpt
@@ -4,6 +4,7 @@ Observer: Generator with 'yield from'
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_generator_04.phpt b/ext/zend_test/tests/observer_generator_04.phpt
index 00cc999ace661..a6c86afab4d52 100644
--- a/ext/zend_test/tests/observer_generator_04.phpt
+++ b/ext/zend_test/tests/observer_generator_04.phpt
@@ -4,6 +4,7 @@ Observer: Generator with manual traversal
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_generator_05.phpt b/ext/zend_test/tests/observer_generator_05.phpt
index dc750bf3ca5a2..dcf8a3897b2d9 100644
--- a/ext/zend_test/tests/observer_generator_05.phpt
+++ b/ext/zend_test/tests/observer_generator_05.phpt
@@ -4,6 +4,7 @@ Observer: Generator with uncaught exception
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_magic_01.phpt b/ext/zend_test/tests/observer_magic_01.phpt
index 0f89fba77f382..51969df570487 100644
--- a/ext/zend_test/tests/observer_magic_01.phpt
+++ b/ext/zend_test/tests/observer_magic_01.phpt
@@ -4,6 +4,7 @@ Observer: Basic magic method observability
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_opline_01.phpt b/ext/zend_test/tests/observer_opline_01.phpt
index 6798d39de6f36..ba291d6debb3a 100644
--- a/ext/zend_test/tests/observer_opline_01.phpt
+++ b/ext/zend_test/tests/observer_opline_01.phpt
@@ -4,6 +4,7 @@ Observer: Ensure opline exists on the execute_data
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_opcode=1
 opcache.jit=0
diff --git a/ext/zend_test/tests/observer_retval_01.phpt b/ext/zend_test/tests/observer_retval_01.phpt
index a63b0bd0efc87..249796ec5ffe7 100644
--- a/ext/zend_test/tests/observer_retval_01.phpt
+++ b/ext/zend_test/tests/observer_retval_01.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: IS_CONST
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 opcache.optimization_level=0
diff --git a/ext/zend_test/tests/observer_retval_02.phpt b/ext/zend_test/tests/observer_retval_02.phpt
index 4f037782e4e9e..e406a8d579305 100644
--- a/ext/zend_test/tests/observer_retval_02.phpt
+++ b/ext/zend_test/tests/observer_retval_02.phpt
@@ -4,6 +4,7 @@ Observer: Unused retvals from generators are still observable
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_03.phpt b/ext/zend_test/tests/observer_retval_03.phpt
index 247c56480b0f0..bf004cd37f150 100644
--- a/ext/zend_test/tests/observer_retval_03.phpt
+++ b/ext/zend_test/tests/observer_retval_03.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: refcounted, IS_CV
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_04.phpt b/ext/zend_test/tests/observer_retval_04.phpt
index a08a5de378ed6..876c30896648a 100644
--- a/ext/zend_test/tests/observer_retval_04.phpt
+++ b/ext/zend_test/tests/observer_retval_04.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: refcounted, IS_VAR
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_05.phpt b/ext/zend_test/tests/observer_retval_05.phpt
index 7d05cb92986b0..81752236696cd 100644
--- a/ext/zend_test/tests/observer_retval_05.phpt
+++ b/ext/zend_test/tests/observer_retval_05.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: IS_CV, IS_UNDEF
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_06.phpt b/ext/zend_test/tests/observer_retval_06.phpt
index ffb41aac59818..a20bba5eb2cd1 100644
--- a/ext/zend_test/tests/observer_retval_06.phpt
+++ b/ext/zend_test/tests/observer_retval_06.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: IS_CV
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_07.phpt b/ext/zend_test/tests/observer_retval_07.phpt
index 9c9c6246f587b..14ce53dae9cd9 100644
--- a/ext/zend_test/tests/observer_retval_07.phpt
+++ b/ext/zend_test/tests/observer_retval_07.phpt
@@ -4,6 +4,7 @@ Observer: Retvals are observable that are: IS_REFERENCE, IS_VAR
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_by_ref_01.phpt b/ext/zend_test/tests/observer_retval_by_ref_01.phpt
index 2a7b74de8a756..0d74229ae9316 100644
--- a/ext/zend_test/tests/observer_retval_by_ref_01.phpt
+++ b/ext/zend_test/tests/observer_retval_by_ref_01.phpt
@@ -4,6 +4,7 @@ Observer: Retvals by reference are observable that are: IS_CV
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_by_ref_02.phpt b/ext/zend_test/tests/observer_retval_by_ref_02.phpt
index b28dc704e4d6a..f1eac5c6051bf 100644
--- a/ext/zend_test/tests/observer_retval_by_ref_02.phpt
+++ b/ext/zend_test/tests/observer_retval_by_ref_02.phpt
@@ -4,6 +4,7 @@ Observer: Retvals by reference are observable that are: IS_TMP_VAR
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_retval_by_ref_03.phpt b/ext/zend_test/tests/observer_retval_by_ref_03.phpt
index 9c4cd622e7da1..ae4372689c9a6 100644
--- a/ext/zend_test/tests/observer_retval_by_ref_03.phpt
+++ b/ext/zend_test/tests/observer_retval_by_ref_03.phpt
@@ -4,6 +4,7 @@ Observer: Retvals by reference are observable that are: IS_VAR, ZEND_RETURNS_FUN
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 opcache.optimization_level=0
diff --git a/ext/zend_test/tests/observer_shutdown_01.phpt b/ext/zend_test/tests/observer_shutdown_01.phpt
index b0ee1bd1a039b..81af69bce8e95 100644
--- a/ext/zend_test/tests/observer_shutdown_01.phpt
+++ b/ext/zend_test/tests/observer_shutdown_01.phpt
@@ -4,6 +4,7 @@ Observer: Function calls from a shutdown handler are observable
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_shutdown_02.phpt b/ext/zend_test/tests/observer_shutdown_02.phpt
index f3fbce36dfb8a..fbe74bf048a0e 100644
--- a/ext/zend_test/tests/observer_shutdown_02.phpt
+++ b/ext/zend_test/tests/observer_shutdown_02.phpt
@@ -4,6 +4,7 @@ Observer: Function calls from a __destruct during shutdown are observable
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_sqlite_create_function.phpt b/ext/zend_test/tests/observer_sqlite_create_function.phpt
index 85d269c9ead1a..a31d35651d78c 100644
--- a/ext/zend_test/tests/observer_sqlite_create_function.phpt
+++ b/ext/zend_test/tests/observer_sqlite_create_function.phpt
@@ -6,6 +6,7 @@ PDO
 pdo_sqlite
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/ext/zend_test/tests/observer_types_01.phpt b/ext/zend_test/tests/observer_types_01.phpt
index de03b355ab1e9..b39f25f9e58ed 100644
--- a/ext/zend_test/tests/observer_types_01.phpt
+++ b/ext/zend_test/tests/observer_types_01.phpt
@@ -4,6 +4,7 @@ Observer: Observe basic TypeError
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 zend_test.observer.show_return_value=1
 --FILE--
diff --git a/ext/zend_test/tests/observer_zend_call_function_01.phpt b/ext/zend_test/tests/observer_zend_call_function_01.phpt
index aed1541f91835..1fa913308a439 100644
--- a/ext/zend_test/tests/observer_zend_call_function_01.phpt
+++ b/ext/zend_test/tests/observer_zend_call_function_01.phpt
@@ -4,6 +4,7 @@ Observer: Calls that go through zend_call_function are observed
 zend_test
 --INI--
 zend_test.observer.enabled=1
+zend_test.observer.show_output=1
 zend_test.observer.observe_all=1
 --FILE--
 <?php
diff --git a/run-tests.php b/run-tests.php
index 18bf1b04925fe..7d87b48e32e4a 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -134,6 +134,10 @@ function show_usage(): void
 
     --bless     Bless failed tests using scripts/dev/bless_tests.php.
 
+    --with-test-observers
+                Run the tests with the zend_test observers registered.
+                This requires the zend_test extension to be enabled.
+
 HELP;
 }
 
@@ -160,7 +164,7 @@ function main(): void
            $temp_source, $temp_target, $test_cnt, $test_dirs,
            $test_files, $test_idx, $test_list, $test_results, $testfile,
            $user_tests, $valgrind, $sum_results, $shuffle, $file_cache, $num_repeats,
-           $bless, $show_progress;
+           $bless, $show_progress, $global_extensions;
     // Parallel testing
     global $workers, $workerID;
     global $context_line_count;
@@ -311,6 +315,7 @@ function main(): void
         'zend.exception_string_param_max_len=15',
         'short_open_tag=0',
     ];
+    $global_extensions = [];
 
     $no_file_cache = '-d opcache.file_cache= -d opcache.file_cache_only=0';
 
@@ -612,6 +617,13 @@ function main(): void
                 case '--version':
                     echo '$Id$' . "\n";
                     exit(1);
+                case '--with-test-observers':
+                    // register zend_test observers but don't actually print any output
+                    $ini_overwrites[] = 'zend_test.observer.enabled=1';
+                    $ini_overwrites[] = 'zend_test.observer.show_output=0';
+                    $ini_overwrites[] = 'zend_test.observer.observe_all=1';
+                    $global_extensions[] = 'zend_test';
+                    break;
 
                 default:
                     echo "Illegal switch '$switch' specified!\n";
@@ -1816,6 +1828,7 @@ function run_test(string $php, $file, array $env): string
     global $slow_min_ms;
     global $preload, $file_cache;
     global $num_repeats;
+    global $global_extensions;
     // Parallel testing
     global $workerID;
     global $show_progress;
@@ -2037,9 +2050,9 @@ function run_test(string $php, $file, array $env): string
     $ini_settings = $workerID ? ['opcache.cache_id' => "worker$workerID"] : [];
 
     // Additional required extensions
-    $extensions = [];
+    $extensions = $global_extensions;
     if ($test->hasSection('EXTENSIONS')) {
-        $extensions = preg_split("/[\n\r]+/", trim($test->getSection('EXTENSIONS')));
+        $extensions = array_merge($extensions, preg_split("/[\n\r]+/", trim($test->getSection('EXTENSIONS'))));
     }
     if (is_array($IN_REDIRECT) && $IN_REDIRECT['EXTENSIONS'] != []) {
         $extensions = array_merge($extensions, $IN_REDIRECT['EXTENSIONS']);