I found the following results when running the PHP implementation of array-reverse:
| Array Size | 100 reversals (s) |
|---|---|
| 100 | 0.108 |
| 1000 | 3.220 |
| 2000 | 12.415 |
| 3000 | 28.19 |
| 4000 | 57.72 |
| 5000 | 99.67 |
| 6000 | 151.6 |
| 7000 | 214.4 |
| 8000 | 286.9 |
| 9000 | 365.7 |
| 10000 | 482 |
Usually, reversing an array takes O(n) time, but this is clearly converging to either O(n^2) time or something even worse. Because PHP arrays are internally hash maps, I suspect that it's approaching O(n) for each array access and thus O(n^2) for the reverse call.
Thus, it is possible to claim that PHP is infinitely worse at this benchmark than every other langauge.