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<?php var_dump(unserialize('O:8:"stdClass":1:{s:3:"foo";i:123;s:3:"bar";i:456;}'));
Output for 4.3.2 - 5.6.28, 7.0.0 - 7.1.0
Notice: unserialize(): Error at offset 35 of 51 bytes in /in/4UqVp on line 2 bool(false)
Output for hhvm-3.10.0 - 3.12.0
Notice: Unable to unserialize: [O:8:"stdClass":1:{s:3:"foo";i:123;s:3:"bar";i:456;}]. Expected '}' but got 's'. in /in/4UqVp on line 2 bool(false)
Output for 4.3.0 - 4.3.1
Notice: unserialize() [http://www.php.net/function.unserialize]: Error at offset 35 of 51 bytes in /in/4UqVp on line 2 bool(false)