3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [3, "AA", [1,2], 444, ["V"]]; $a = @array_keys(array_flip($arr)); print_r($a);

This is an error 500

Value for `_results` contains invalid data `array`


preferences:
156.39 ms | 2228 KiB | 11 Q