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run code in 300+ PHP versions simultaneously
<?php var_dump(unserialize('o:0:"":1:{}'));
Output for 8.3.0 - 8.3.6
Warning: unserialize(): Error at offset 0 of 11 bytes in /in/U8Hsa on line 2 bool(false)
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Notice: unserialize(): Error at offset 0 of 11 bytes in /in/U8Hsa on line 2 bool(false)
Output for 7.3.32 - 7.3.33
bool(false)
Output for 5.6.31 - 5.6.40, 7.0.21 - 7.0.33, 7.1.8 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Notice: unserialize(): Error at offset 5 of 11 bytes in /in/U8Hsa on line 2 bool(false)
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
Notice: unserialize(): Error at offset 6 of 11 bytes in /in/U8Hsa on line 2 bool(false)
Output for 4.3.0
Notice: unserialize() [http://www.php.net/function.unserialize]: Error at offset 6 of 11 bytes in /in/U8Hsa on line 2 bool(false)

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