Bug #68099 [NEW]: Unable to unserialize data after implementing Serializable

From: manuel-php at mausz dot at Operating system: PHP version: 5.6.1RC1 Package: *General Issues Bug Type: Bug Bug description:Unable to unserialize data after implementing Serializable Description: ------------ Consider the following case: * User implements class Foo which gets serialized and unserialized during daily use. Serialized data is stored somewhere. * User changes class Foo to implement Serializable * User still wants to transparently unserialize his old data This worked in PHP5.5 and below. It's broken in PHP 5.6.0 and above. If this is intended than this is a major BC break not mentioned in the upgrade guidelines. Test script: --------------- <?php error_reporting(E_ALL); # export ... simulates exporting old data where class Foo didn't implement Serializable $mode = (isset($argv[1]) && $argv[1] === 'import') ? 'import' : 'export'; if ($mode === 'export') { class Foo { protected $foo = null; public function __construct() { $this->foo = "something"; } } $foo = new Foo(); $data = serialize($foo); file_put_contents('/tmp/phpbug', $data); } else { class Foo implements Serializable { protected $foo = null; public function __construct() { $this->foo = "something"; } public function serialize() { echo __CLASS__ . "::serialize called\n"; return $this->foo; } public function unserialize($data) { echo __CLASS__ . "::unserialize called\n"; $this->foo = $data; } } $data = file_get_contents('/tmp/phpbug'); $foo = unserialize($data); if ($foo instanceof Foo) echo "Thumbs up!\n"; else echo "Unserialize FAILED\n"; } Expected result: ---------------- # php5.5 serialize.php export; php5.5 serialize.php import Thumbs up! Actual result: -------------- ./php-src-PHP-5.6.1/sapi/cli/php serialize.php export ; ./php-src-PHP-5.6.1/sapi/cli/php serialize.php import Warning: Erroneous data format for unserializing 'Foo' in /home/manuel/serialize.php on line 49 Notice: unserialize(): Error at offset 13 of 43 bytes in /home/manuel/serialize.php on line 49 Unserialize FAILED -- Edit bug report at https://bugs.php.net/bug.php?id=68099&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68099&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68099&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68099&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68099&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68099&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68099&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68099&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68099&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68099&r=support Expected behavior: https://bugs.php.net/fix.php?id=68099&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68099&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68099&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68099&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68099&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68099&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68099&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68099&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68099&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68099&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68099&r=mysqlcfg