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<?php $a = range(-10, 10); $b = range(-10, 10, 0.5); $opResults = []; $funcResults = []; foreach($a as $_a) { foreach($b as $_b) { $opResults[] = $_a ** $_b; $funcResults[] = pow($_a, $_b); } } var_dump($opResults == $funcResults, array_diff($opResults, $funcResults));

preferences:
37.41 ms | 402 KiB | 5 Q