Online PHP editor | perf for ri89S

<?php function generate($array) { // 1 loop over data foreach ($array as $v) { yield 'key' . $v => 'value' . $v; } } function generator($array) { // 1 parent loop over data return iterator_to_array(generate($array)); } function construct($array) { // 1 loop over data $result = []; foreach ($array as $v) { $result['key' . $v] = 'value' . $v; } return $result; } function substrReplaceCombine($array) { return array_combine( substr_replace($array, 'key', 0, 0), substr_replace($array, 'value', 0, 0) ); } function mapCombine($array) { // 3 loops over data return array_combine( array_map( fn($v) => 'key' . $v, $array ), array_map( fn($v) => 'value' . $v, $array ), ); } function mapFlatten($array) { // 3 loops over data return array_merge( ...array_map( fn($v) => ['key' . $v => 'value' . $v], $array ), ); } function mapUncolumn($array) { // 2 loops over data return array_column( array_map( fn($v) => ['key' . $v, 'value' . $v], $array ), 1, 0 ); } function walk($array) { // 1 loop over data $result = []; array_walk( $array, function($v) use (&$result) { $result['key' . $v] = 'value' . $v; } ); return $result; } function reduce($array) { // 1 loop over data return array_reduce( $array, function($result, $v) { $result['key' . $v] = 'value' . $v; return $result; }, new ArrayObject() ); } function returnTime(callable $function, int $repeat = 20) { $tests = []; for ($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, 5000); foreach (['generator', 'construct', 'substrReplaceCombine', 'mapCombine', 'mapFlatten', 'mapUncolumn', 'walk', 'reduce'] as $test) { echo "Duration of $test: ", returnTime(fn() => $test($array)) . PHP_EOL; }

Version	System time (s)	User time (s)	Memory (MiB)
8.3.4	0.020	0.176	23.84
8.3.3	0.007	0.162	23.52
8.3.2	0.010	0.190	25.90
8.3.1	0.007	0.166	25.97
8.3.0	0.020	0.182	22.97
8.2.17	0.017	0.154	23.12
8.2.16	0.023	0.173	24.26
8.2.15	0.023	0.146	23.39
8.2.14	0.013	0.163	24.87
8.2.13	0.017	0.174	24.68
8.2.12	0.020	0.190	23.51
8.2.11	0.024	0.148	23.69
8.2.10	0.010	0.159	23.69
8.2.9	0.013	0.181	23.11
8.2.8	0.013	0.170	23.75
8.2.7	0.023	0.149	22.82
8.2.6	0.017	0.177	23.21
8.2.5	0.017	0.176	23.18
8.2.4	0.016	0.171	23.28
8.2.3	0.024	0.173	22.95
8.2.2	0.010	0.179	22.86
8.2.1	0.024	0.162	22.98
8.2.0	0.023	0.161	22.81
8.1.27	0.013	0.153	25.73
8.1.26	0.010	0.158	25.79
8.1.25	0.026	0.171	25.84
8.1.24	0.016	0.183	22.10
8.1.23	0.016	0.165	22.60
8.1.22	0.020	0.172	22.83
8.1.21	0.016	0.171	22.15
8.1.20	0.014	0.163	22.59
8.1.19	0.017	0.175	22.70
8.1.18	0.017	0.181	22.21
8.1.17	0.023	0.171	22.46
8.1.16	0.013	0.158	22.23
8.1.15	0.020	0.150	22.35
8.1.14	0.017	0.170	22.29
8.1.13	0.017	0.156	22.42
8.1.12	0.017	0.174	22.56
8.1.11	0.007	0.165	22.15
8.1.10	0.020	0.158	23.54
8.1.9	0.013	0.158	22.31
8.1.8	0.010	0.160	25.70
8.1.7	0.010	0.157	22.54
8.1.6	0.007	0.178	22.34
8.1.5	0.023	0.157	22.35
8.1.4	0.020	0.172	22.28
8.1.3	0.003	0.184	22.65
8.1.2	0.023	0.147	23.60
8.1.1	0.020	0.173	22.41
8.1.0	0.010	0.157	22.27