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<?php var_dump(unserialize('O:8:"stdClass":++:{}'));
Output for 8.3.0 - 8.3.6
Warning: unserialize(): Error at offset 16 of 20 bytes in /in/qdBI3 on line 3 bool(false)
Output for 8.2.2 - 8.2.18
Notice: unserialize(): Error at offset 16 of 20 bytes in /in/qdBI3 on line 3 bool(false)
Output for 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.1
Notice: unserialize(): Error at offset 18 of 20 bytes in /in/qdBI3 on line 3 bool(false)
Output for 7.3.32 - 7.3.33, 7.4.26
bool(false)
Output for 7.1.10 - 7.1.20, 7.2.0 - 7.2.33
Notice: unserialize(): Error at offset 17 of 20 bytes in /in/qdBI3 on line 3 bool(false)
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
Notice: unserialize(): Error at offset 19 of 20 bytes in /in/qdBI3 on line 3 bool(false)
Output for 4.3.0 - 4.3.1
Notice: unserialize() [http://www.php.net/function.unserialize]: Error at offset 19 of 20 bytes in /in/qdBI3 on line 3 bool(false)

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