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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 - 8.3.19, 8.4.1 - 8.4.5
{ "['foo', 1]": 1, "['foo' => 1]": "foo", "['foo' => 'bar']": null }

preferences:
63.63 ms | 411 KiB | 5 Q