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<?php $arr = [1,2,3]; var_dump(key(array_values($arr))); var_dump(end(array_values($arr)));
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(0) Notice: Only variables should be passed by reference in /in/d9QYP on line 4 int(3)
Output for 7.3.32 - 7.3.33
int(0) int(3)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
int(0) Strict Standards: Only variables should be passed by reference in /in/d9QYP on line 4 int(3)

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260.9 ms | 402 KiB | 376 Q