3v4l.org

run code in 300+ PHP versions simultaneously
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Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.23, 8.4.1 - 8.4.10
array(2) { ["a"]=> array(2) { ["value"]=> int(5) ["key"]=> string(1) "a" } ["b"]=> array(2) { ["value"]=> int(3) ["key"]=> string(1) "b" } }

preferences:
134.63 ms | 413 KiB | 5 Q