diff --git a/NEWS b/NEWS
index e22b0994ff761..60bab0e669216 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,7 @@ PHP                                                                        NEWS
 
 - Added LIBXML_LOADED_VERSION constant (libxml2 version currently used). (Rob)
 
+- Fixed bug #47664 (get_class returns NULL instead of FALSE). (Dmitry)
 - Fixed bug #47593 (interface_exists() returns false when using absolute 
   namespace path). (Kalle, Felipe)
 - Fixed bug #47572 (Undefined constant causes segmentation fault). (Felipe)
diff --git a/Zend/tests/009.phpt b/Zend/tests/009.phpt
index 3efda91b684bf..f122b714dac2f 100644
--- a/Zend/tests/009.phpt
+++ b/Zend/tests/009.phpt
@@ -42,7 +42,7 @@ Warning: get_class() called without object from outside a class in %s on line %d
 bool(false)
 
 Warning: get_class() expects parameter 1 to be object, string given in %s on line %d
-NULL
+bool(false)
 string(3) "foo"
 string(4) "foo2"
 Done
diff --git a/Zend/zend_builtin_functions.c b/Zend/zend_builtin_functions.c
index 3dbd080510307..6f1774de273a8 100644
--- a/Zend/zend_builtin_functions.c
+++ b/Zend/zend_builtin_functions.c
@@ -719,7 +719,7 @@ ZEND_FUNCTION(get_class)
 	int dup;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|o", &obj) == FAILURE) {
-		return;
+		RETURN_FALSE;
 	}
 
 	if (!obj) {
diff --git a/ext/standard/tests/class_object/get_class_error_001.phpt b/ext/standard/tests/class_object/get_class_error_001.phpt
index fb3bacb904ef8..555099502dd81 100644
--- a/ext/standard/tests/class_object/get_class_error_001.phpt
+++ b/ext/standard/tests/class_object/get_class_error_001.phpt
@@ -24,5 +24,5 @@ echo "Done";
 -- Testing get_class() function with more than expected no. of arguments --
 
 Warning: get_class() expects at most 1 parameter, 2 given in %s on line 14
-NULL
+bool(false)
 Done
\ No newline at end of file
diff --git a/ext/standard/tests/class_object/get_class_variation_001.phpt b/ext/standard/tests/class_object/get_class_variation_001.phpt
index 2e83b1dc5eea7..79caa1f30d171 100644
--- a/ext/standard/tests/class_object/get_class_variation_001.phpt
+++ b/ext/standard/tests/class_object/get_class_variation_001.phpt
@@ -76,137 +76,137 @@ echo "Done";
 --EXPECTF--
 *** Testing get_class() : usage variations ***
 
-Notice: Undefined variable: undefined_var in %s on line 58
+Notice: Undefined variable: undefined_var in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 58
 
-Notice: Undefined variable: unset_var in %s on line 61
+Notice: Undefined variable: unset_var in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 61
 
 Arg value: 0 (type: integer)
 
-Warning: get_class() expects parameter 1 to be object, integer given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, integer given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 1 (type: integer)
 
-Warning: get_class() expects parameter 1 to be object, integer given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, integer given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 12345 (type: integer)
 
-Warning: get_class() expects parameter 1 to be object, integer given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, integer given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: -2345 (type: integer)
 
-Warning: get_class() expects parameter 1 to be object, integer given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, integer given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 10.5 (type: double)
 
-Warning: get_class() expects parameter 1 to be object, double given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, double given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: -10.5 (type: double)
 
-Warning: get_class() expects parameter 1 to be object, double given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, double given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 101234567000 (type: double)
 
-Warning: get_class() expects parameter 1 to be object, double given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, double given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 1.07654321E-9 (type: double)
 
-Warning: get_class() expects parameter 1 to be object, double given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, double given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 0.5 (type: double)
 
-Warning: get_class() expects parameter 1 to be object, double given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, double given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: Array (type: array)
 
-Warning: get_class() expects parameter 1 to be object, array given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, array given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: Array (type: array)
 
-Warning: get_class() expects parameter 1 to be object, array given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, array given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: Array (type: array)
 
-Warning: get_class() expects parameter 1 to be object, array given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, array given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: Array (type: array)
 
-Warning: get_class() expects parameter 1 to be object, array given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, array given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: Array (type: array)
 
-Warning: get_class() expects parameter 1 to be object, array given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, array given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: NULL)
 
-Warning: get_class() expects parameter 1 to be object, null given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, null given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: NULL)
 
-Warning: get_class() expects parameter 1 to be object, null given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, null given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 1 (type: boolean)
 
-Warning: get_class() expects parameter 1 to be object, boolean given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, boolean given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: boolean)
 
-Warning: get_class() expects parameter 1 to be object, boolean given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, boolean given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: 1 (type: boolean)
 
-Warning: get_class() expects parameter 1 to be object, boolean given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, boolean given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: boolean)
 
-Warning: get_class() expects parameter 1 to be object, boolean given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, boolean given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: string)
 
-Warning: get_class() expects parameter 1 to be object, string given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, string given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: string)
 
-Warning: get_class() expects parameter 1 to be object, string given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, string given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: string (type: string)
 
-Warning: get_class() expects parameter 1 to be object, string given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, string given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value: string (type: string)
 
-Warning: get_class() expects parameter 1 to be object, string given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, string given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: NULL)
 
-Warning: get_class() expects parameter 1 to be object, null given in %s on line %d
-NULL
+Warning: get_class() expects parameter 1 to be object, null given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
 
 Arg value:  (type: NULL)
 
-Warning: get_class() expects parameter 1 to be object, null given in %s on line %d
-NULL
-Done
\ No newline at end of file
+Warning: get_class() expects parameter 1 to be object, null given in /home/dmitry/php/php5.3/ext/standard/tests/class_object/get_class_variation_001.php on line 68
+bool(false)
+Done