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Request #62919 Serialize Reflection
Submitted: 2012-08-24 09:26 UTC Modified: 2012-08-24 09:32 UTC
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:1 (50.0%)
Same OS:1 (50.0%)
From: mattia dot citterio at gmail dot com Assigned:
Status: Open Package: Reflection related
PHP Version: Irrelevant OS: Linux
Private report: No CVE-ID: None
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 [2012-08-24 09:26 UTC] mattia dot citterio at gmail dot com
Cannot serialize/deserialize objects. This is the produced error on the last line:

PHP Fatal error:  ReflectionClass::newInstanceArgs(): Internal error: Failed to 
retrieve the reflection object

Test script:
class A {
    public function __construct() {

$r = new ReflectionClass('A');
$r = unserialize(serialize($r));
$a = $r->newInstanceArgs(array());


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 [2012-08-24 09:32 UTC]
-Type: Bug +Type: Feature/Change Request
 [2012-08-24 09:32 UTC]
Reflection* doesn't define their __sleep/__wakeup methods.  so change to FR 
instead of a bug
 [2014-07-10 15:06 UTC] tom at r dot je
This would be very useful, however I can see why this may be problematic for internals. If the class definition has changed since the reflection object was serialized and unserialzed, then it would cause all sorts of issues. The only sensible thing that __wakeup could do is call __construct, and in actual fact, this works:

class A {
		public function __construct() {

$r = new ReflectionClass('A');

$s = serialize($r);

$r1 = unserialize($s);


$a = $r1->newInstanceArgs();


So having __wakeup call __construct with the class name would allow reflection to be serialized, if like me, you were hoping to cache reflection using memcached for performance reasons, serialization in this manner would not be beneficial as it would be just as slow to unserialize as to construct a new object.
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