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run code in 300+ PHP versions simultaneously
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Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.17, 8.4.1 - 8.4.5
array(2) { [123]=> string(1) "1" ["W"]=> string(3) "123" } Warning: Undefined array key "W" in /in/oWS6G on line 9 array(3) { [123]=> string(1) "1" ["W"]=> string(3) "123" ["W"]=> string(3) "999" } 999
Output for 5.6.38, 7.0.33, 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
array(2) { [123]=> string(1) "1" ["W"]=> string(3) "123" } Notice: Undefined index: W in /in/oWS6G on line 9 array(3) { [123]=> string(1) "1" ["W"]=> string(3) "123" ["W"]=> string(3) "999" } 999
Output for 7.3.32 - 7.3.33
array(2) { [123]=> string(1) "1" ["W"]=> string(3) "123" } array(3) { [123]=> string(1) "1" ["W"]=> string(3) "123" ["W"]=> string(3) "999" } 999

preferences:
147.23 ms | 413 KiB | 5 Q