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<?php declare(strict_types = 1); /** @noinspection AutoloadingIssuesInspection */ class BenchmarkCase { public static $maxNameLength; public $callable; public $iterations = 0; public $name; public $timing = 0; public static function create(string $name, callable $callable): self { $self = new self; $self->name = $name; $self->callable = $callable; self::$maxNameLength = max(self::$maxNameLength, strlen($name)); return $self; } public static function printResults(float $initialMs, array $cases): void { $durationMs = microtime(true) - $initialMs; printf("\r"); usort($cases, static function (BenchmarkCase $a, BenchmarkCase $b) { return $a->timing <=> $b->timing; }); $caseFirst = $cases[0]->timing; /** @var BenchmarkCase $case */ foreach ($cases as $case) { printf("Case %s duration of %.6fs (avg. each %.8fs) +%.2f%%\n", str_pad($case->name, self::$maxNameLength, ' '), $case->timing, bcdiv((string) $case->timing, (string) $case->iterations, 8), (100 / $caseFirst * $case->timing) - 100); } printf("\nTotal duration: %.6fs", $durationMs); } } set_error_handler(static function ($severity, $message) { throw new ErrorException($message, 0, $severity); }); $cases = [ BenchmarkCase::create('array_merge() inside looping', static function () { $arr = []; for ($i = 0; $i < 100; $i++) { $arr = array_merge($arr, [ $i, $i ]); } return $arr; }), BenchmarkCase::create('array_merge() after looping', static function () { $arrArr = []; for ($i = 0; $i < 100; $i++) { $arrArr[] = [ $i, $i ]; } return array_merge(... $arrArr); }), BenchmarkCase::create('array_push() inside looping', static function () { $arr = []; for ($i = 0; $i < 100; $i++) { array_push($arr, $i, $i); } return $arr; }), ]; const BENCHMARK_DURATION_MS = 1500; const CYCLES_ITERATION = 100; $initialMs = microtime(true); $stopTiming = $initialMs + BENCHMARK_DURATION_MS / 1000; while (($currentTiming = microtime(true)) < $stopTiming) { /** @noinspection NonSecureShuffleUsageInspection */ shuffle($cases); /** @var BenchmarkCase $case */ foreach ($cases as $case) { $startMs = microtime(true); for ($j = 0; $j < CYCLES_ITERATION; $j++) { call_user_func($case->callable); } $case->iterations += CYCLES_ITERATION; $case->timing += microtime(true) - $startMs; } } BenchmarkCase::printResults($initialMs, $cases);

Version	System time (s)	User time (s)	Memory (MiB)
8.0.8	0.018	1.491	16.99
8.0.7	0.020	1.501	17.00
8.0.6	0.010	1.499	16.91
8.0.5	0.013	1.489	16.97
8.0.3	0.016	1.491	17.02
8.0.2	0.003	1.501	17.10
8.0.1	0.010	1.500	17.06
8.0.0	0.016	1.508	17.17
7.4.21	0.013	1.488	16.48
7.4.20	0.020	1.490	16.68
7.4.19	0.010	1.501	16.84
7.4.18	0.019	1.505	16.64
7.4.16	0.023	1.493	16.64
7.4.15	0.023	1.487	16.57
7.4.14	0.022	1.503	16.68
7.4.13	0.026	1.502	16.46
7.4.12	0.013	1.506	16.69
7.4.11	0.013	1.506	16.72
7.4.10	0.033	1.476	16.52
7.4.9	0.010	1.503	16.55
7.4.8	0.019	1.497	16.50
7.4.7	0.020	1.494	16.67
7.4.6	0.013	1.505	16.60
7.4.5	0.010	1.506	16.49
7.4.4	0.026	1.494	16.47
7.4.3	0.017	1.498	16.63
7.4.2	0.013	1.509	16.46
7.4.1	0.016	1.488	16.72
7.4.0	0.029	1.481	16.60
7.3.29	0.020	1.506	16.39
7.3.28	0.027	1.495	16.45
7.3.27	0.023	1.501	16.43
7.3.26	0.016	1.508	16.36
7.3.25	0.026	1.502	16.44
7.3.24	0.026	1.504	16.41
7.3.23	0.023	1.494	16.46
7.3.22	0.026	1.490	16.43
7.3.21	0.022	1.504	16.38
7.3.20	0.010	1.506	16.30
7.3.19	0.026	1.504	16.43
7.3.18	0.033	1.494	16.41
7.3.17	0.016	1.506	16.39
7.3.16	0.020	1.507	16.35
7.3.15	0.020	1.507	16.43
7.3.14	0.019	1.515	16.40
7.3.13	0.017	1.517	16.40
7.3.12	0.026	1.498	16.39
7.3.11	0.017	1.505	16.39
7.3.10	0.020	1.507	16.34
7.3.9	0.030	1.492	16.57
7.3.8	0.017	1.516	16.37
7.3.7	0.020	1.509	16.43
7.3.6	0.033	1.491	16.52
7.3.5	0.023	1.493	16.55
7.3.4	0.029	1.479	16.53
7.3.3	0.026	1.495	16.58
7.3.2	0.013	1.511	16.56
7.3.1	0.026	1.495	16.49
7.3.0	0.023	1.498	16.57
7.1.33	0.022	1.414	15.74