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<?php $classNames = array( "Foo", // userland class "StdClass", // class defined by php-src, but still not considered as internal "Bar", // userland class implementing Serializable "ReflectionClass", // internal class "ArrayObject", // internal class implementing Serializable ); function instanitateWithoutConstructorThroughUnserialize($className) { return unserialize(sprintf('O:%d:"%s":0:{}', strlen($className), $className)); } function instanitateWithoutConstructorThroughReflection($className) { try { $ref = new ReflectionClass($className); return $ref->newInstanceWithoutConstructor(); } catch (ReflectionException $e) { return $e; } } class Foo {} class Bar implements Serializable { private $data; public function serialize() { return serialize($this->data); } public function unserialize($data) { $this->data = unserialize($data); } } foreach($classNames as $className) { echo "$className\n"; var_dump(instanitateWithoutConstructorThroughUnserialize($className)); if (version_compare(PHP_VERSION, '5.4.0') >= 0) { var_dump(instanitateWithoutConstructorThroughReflection($className)); } echo "\n"; }
Output for 8.3.0 - 8.3.4
Deprecated: Bar implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/AohKP on line 26 Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 Warning: unserialize(): Error at offset 13 of 14 bytes in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass Fatal error: Uncaught Exception: Unserialization of 'ReflectionClass' is not allowed in /in/AohKP:12 Stack trace: #0 /in/AohKP(12): unserialize('O:15:"Reflectio...') #1 /in/AohKP(41): instanitateWithoutConstructorThroughUnserialize('ReflectionClass') #2 {main} thrown in /in/AohKP on line 12
Process exited with code 255.
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
Deprecated: Bar implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /in/AohKP on line 26 Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 13 of 14 bytes in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass Fatal error: Uncaught Exception: Unserialization of 'ReflectionClass' is not allowed in /in/AohKP:12 Stack trace: #0 /in/AohKP(12): unserialize('O:15:"Reflectio...') #1 /in/AohKP(41): instanitateWithoutConstructorThroughUnserialize('ReflectionClass') #2 {main} thrown in /in/AohKP on line 12
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 13 of 14 bytes in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass Warning: Erroneous data format for unserializing 'ReflectionClass' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 26 of 27 bytes in /in/AohKP on line 12 bool(false) object(ReflectionClass)#1 (1) { ["name"]=> string(0) "" } ArrayObject Fatal error: Uncaught UnexpectedValueException: Incomplete or ill-typed serialization data in /in/AohKP:12 Stack trace: #0 [internal function]: ArrayObject->__unserialize(Array) #1 /in/AohKP(12): unserialize('O:11:"ArrayObje...') #2 /in/AohKP(41): instanitateWithoutConstructorThroughUnserialize('ArrayObject') #3 {main} thrown in /in/AohKP on line 12
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass object(ReflectionClass)#2 (1) { ["name"]=> string(0) "" } object(ReflectionClass)#1 (1) { ["name"]=> string(0) "" } ArrayObject Warning: Erroneous data format for unserializing 'ArrayObject' in /in/AohKP on line 12 bool(false) object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(0) { } }
Output for 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 13 of 14 bytes in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass object(ReflectionClass)#2 (1) { ["name"]=> string(0) "" } object(ReflectionClass)#1 (1) { ["name"]=> string(0) "" } ArrayObject Warning: Erroneous data format for unserializing 'ArrayObject' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 22 of 23 bytes in /in/AohKP on line 12 bool(false) object(ArrayObject)#2 (1) { ["storage":"ArrayObject":private]=> array(0) { } }
Output for 5.4.0 - 5.4.28, 5.4.30 - 5.4.45, 5.5.24 - 5.5.35
Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar object(Bar)#1 (1) { ["data":"Bar":private]=> NULL } object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass object(ReflectionClass)#2 (1) { ["name"]=> string(0) "" } object(ReflectionException)#1 (7) { ["message":protected]=> string(103) "Class ReflectionClass is an internal class that cannot be instantiated without invoking its constructor" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/AohKP" ["line":protected]=> int(18) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(18) ["function"]=> string(29) "newInstanceWithoutConstructor" ["class"]=> string(15) "ReflectionClass" ["type"]=> string(2) "->" ["args"]=> array(0) { } } [1]=> array(4) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(43) ["function"]=> string(46) "instanitateWithoutConstructorThroughReflection" ["args"]=> array(1) { [0]=> string(15) "ReflectionClass" } } } ["previous":"Exception":private]=> NULL } ArrayObject object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(0) { } } object(ReflectionException)#2 (7) { ["message":protected]=> string(99) "Class ArrayObject is an internal class that cannot be instantiated without invoking its constructor" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/AohKP" ["line":protected]=> int(18) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(18) ["function"]=> string(29) "newInstanceWithoutConstructor" ["class"]=> string(15) "ReflectionClass" ["type"]=> string(2) "->" ["args"]=> array(0) { } } [1]=> array(4) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(43) ["function"]=> string(46) "instanitateWithoutConstructorThroughReflection" ["args"]=> array(1) { [0]=> string(11) "ArrayObject" } } } ["previous":"Exception":private]=> NULL }
Output for 5.4.29
Foo object(Foo)#1 (0) { } object(Foo)#2 (0) { } StdClass object(stdClass)#2 (0) { } object(stdClass)#1 (0) { } Bar Warning: Erroneous data format for unserializing 'Bar' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 13 of 14 bytes in /in/AohKP on line 12 bool(false) object(Bar)#2 (1) { ["data":"Bar":private]=> NULL } ReflectionClass object(ReflectionClass)#2 (1) { ["name"]=> string(0) "" } object(ReflectionException)#1 (7) { ["message":protected]=> string(103) "Class ReflectionClass is an internal class that cannot be instantiated without invoking its constructor" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/AohKP" ["line":protected]=> int(18) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(18) ["function"]=> string(29) "newInstanceWithoutConstructor" ["class"]=> string(15) "ReflectionClass" ["type"]=> string(2) "->" ["args"]=> array(0) { } } [1]=> array(4) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(43) ["function"]=> string(46) "instanitateWithoutConstructorThroughReflection" ["args"]=> array(1) { [0]=> string(15) "ReflectionClass" } } } ["previous":"Exception":private]=> NULL } ArrayObject Warning: Erroneous data format for unserializing 'ArrayObject' in /in/AohKP on line 12 Notice: unserialize(): Error at offset 22 of 23 bytes in /in/AohKP on line 12 bool(false) object(ReflectionException)#2 (7) { ["message":protected]=> string(99) "Class ArrayObject is an internal class that cannot be instantiated without invoking its constructor" ["string":"Exception":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/AohKP" ["line":protected]=> int(18) ["trace":"Exception":private]=> array(2) { [0]=> array(6) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(18) ["function"]=> string(29) "newInstanceWithoutConstructor" ["class"]=> string(15) "ReflectionClass" ["type"]=> string(2) "->" ["args"]=> array(0) { } } [1]=> array(4) { ["file"]=> string(9) "/in/AohKP" ["line"]=> int(43) ["function"]=> string(46) "instanitateWithoutConstructorThroughReflection" ["args"]=> array(1) { [0]=> string(11) "ArrayObject" } } } ["previous":"Exception":private]=> NULL }
Output for 5.3.0 - 5.3.29
Foo object(Foo)#1 (0) { } StdClass object(stdClass)#1 (0) { } Bar object(Bar)#1 (1) { ["data":"Bar":private]=> NULL } ReflectionClass object(ReflectionClass)#1 (1) { ["name"]=> string(0) "" } ArrayObject object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(0) { } }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Foo object(Foo)#1 (0) { } StdClass object(stdClass)#1 (0) { } Bar object(Bar)#1 (1) { ["data:private"]=> NULL } ReflectionClass object(ReflectionClass)#1 (1) { ["name"]=> string(0) "" } ArrayObject object(ArrayObject)#1 (0) { }
Output for 5.0.5
Fatal error: Interface 'Serializable' not found in /in/AohKP on line 26
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Serializable' not found in /in/AohKP on line 26
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '{' in /in/AohKP on line 16
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '{' in /in/AohKP on line 16
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/AohKP on line 16
Process exited with code 255.

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