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run code in 300+ PHP versions simultaneously
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Output for 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6
string(31) "O:8:"FooChild":1:{s:3:"bar";N;}"

preferences:
74.96 ms | 411 KiB | 5 Q