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<?php function returnTime(callable $function, int $repeat = 50) { $tests = []; for ($i = 0; $i < $repeat; ++$i) { $startTime = microtime(true); $function(); $endTime = microtime(true); $tests[] = $endTime - $startTime; } // Representing the average return 1000 * array_sum($tests) / $repeat; } $array = range(0, 450000); unset($array[0]); echo "Duration of array_values: ", returnTime(function() use ($array) { $newArray = array_values($array); }); echo PHP_EOL; echo "Duration of splat-pack: " , returnTime(function() use ($array){ $newArray = [...$array]; });

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Output for git.master
Duration of array_values: 3.6937761306763 Duration of splat-pack: 3.2344770431519
Output for git.master_jit
Duration of array_values: 3.8065671920776 Duration of splat-pack: 3.4878301620483
Output for rfc.property-hooks
Duration of array_values: 3.1260633468628 Duration of splat-pack: 2.6188898086548

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