Online PHP editor | perf for j9Reg

<?php function generator($array, $prefix) { foreach ($array as $k => $v) { yield $prefix . $k => $v; } } function generatorPrefix($array, $prefix = 'prefix') { return iterator_to_array(generator($array, $prefix)); } function constructPrefix($array, $prefix = 'prefix') { // 1 loop over data $result = []; foreach ($array as $k => $v) { $result[$prefix . $k] = $v; } return $result; } function mapKeyAndCombinePrefix($array, $prefix = 'prefix') { // 3 loops over data return array_combine( array_map( fn($k) => $prefix . $k, array_keys($array) ), $array ); } function walkPrefix($array, $prefix = 'prefix') { // 1 loop over data $result = []; array_walk( $array, function($v, $k, $prefix) use (&$result) { $result[$prefix . $k] = $v; }, $prefix ); return $result; } function reducePrefix($array, $prefix = 'prefix') { // 2 loops over data return array_reduce( array_keys($array), function($result, $k) use ($array, $prefix) { $result[$prefix . $k] = $array[$k]; return $result; }, [] ); } 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 (['generatorPrefix', 'constructPrefix', 'mapKeyAndCombinePrefix', 'walkPrefix', 'reducePrefix'] as $test) { echo "Duration of $test: ", returnTime(fn() => $test($array)) . PHP_EOL; }

Version	System time (s)	User time (s)	Memory (MiB)
8.3.3	0.008	1.558	22.96
8.2.5	0.020	1.038	19.52
8.2.4	0.010	1.045	19.52
8.2.3	0.017	1.032	19.52
8.2.2	0.013	1.055	19.52
8.2.1	0.003	1.049	19.52
8.2.0	0.010	1.037	19.52
8.1.18	0.007	1.025	19.52
8.1.17	0.007	1.035	19.52
8.1.16	0.013	1.022	19.52
8.1.15	0.020	1.008	19.52
8.1.14	0.013	1.024	19.52
8.1.13	0.013	1.016	19.52
8.1.12	0.007	1.035	19.52
8.1.11	0.007	1.022	19.52
8.1.10	0.023	1.012	19.52
8.1.9	0.013	1.034	19.52
8.1.8	0.017	1.016	19.52
8.1.7	0.007	1.026	19.52
8.1.6	0.026	1.009	19.52
8.1.5	0.013	1.019	19.52
8.1.4	0.017	1.030	19.52
8.1.3	0.013	1.023	19.52
8.1.2	0.013	1.022	19.52
8.1.1	0.007	1.028	19.52
8.1.0	0.020	1.022	19.52
8.0.28	0.017	1.028	19.52
8.0.27	0.020	1.021	19.52
8.0.26	0.013	1.014	19.52
8.0.25	0.010	1.036	19.52
8.0.24	0.017	1.029	19.52
8.0.23	0.013	1.030	19.52
8.0.22	0.013	1.019	19.52
8.0.21	0.013	1.045	19.52
8.0.20	0.010	1.028	19.52
8.0.19	0.010	1.034	19.52
8.0.18	0.013	1.024	19.52
8.0.17	0.016	1.018	19.52
8.0.16	0.003	1.031	19.52
8.0.15	0.017	1.022	19.52
8.0.14	0.013	1.028	19.52
8.0.13	0.003	1.033	19.52
8.0.12	0.013	1.022	19.52
8.0.11	0.007	1.028	19.52
8.0.10	0.020	1.016	19.52
8.0.9	0.007	1.033	19.52
8.0.8	0.003	1.029	19.52
8.0.7	0.017	1.016	19.52
8.0.6	0.013	1.021	19.52
8.0.5	0.010	1.023	19.52
8.0.3	0.020	1.017	19.52
8.0.2	0.023	1.007	19.52
8.0.1	0.010	1.025	19.52

Version

System time (s)

User time (s)

Memory (MiB)

8.3.3

0.008

1.558

22.96

8.2.5

0.020

1.038

19.52

8.2.4

0.010

1.045

19.52

8.2.3

0.017

1.032

19.52

8.2.2

0.013

1.055

19.52

8.2.1

0.003

1.049

19.52

8.2.0

0.010

1.037

19.52

8.1.18

0.007

1.025

19.52

8.1.17

0.007

1.035

19.52

8.1.16

0.013

1.022

19.52

8.1.15

0.020

1.008

19.52

8.1.14

0.013

1.024

19.52

8.1.13

0.013

1.016

19.52

8.1.12

0.007

1.035

19.52

8.1.11

0.007

1.022

19.52

8.1.10

0.023

1.012

19.52

8.1.9

0.013

1.034

19.52

8.1.8

0.017

1.016

19.52

8.1.7

0.007

1.026

19.52

8.1.6

0.026

1.009

19.52

8.1.5

0.013

1.019

19.52

8.1.4

0.017

1.030

19.52

8.1.3

0.013

1.023

19.52

8.1.2

0.013

1.022

19.52

8.1.1

0.007

1.028

19.52

8.1.0

0.020

1.022

19.52

8.0.28

0.017

1.028

19.52

8.0.27

0.020

1.021

19.52

8.0.26

0.013

1.014

19.52

8.0.25

0.010

1.036

19.52

8.0.24

0.017

1.029

19.52

8.0.23

0.013

1.030

19.52

8.0.22

0.013

1.019

19.52

8.0.21

0.013

1.045

19.52

8.0.20

0.010

1.028

19.52

8.0.19

0.010

1.034

19.52

8.0.18

0.013

1.024

19.52

8.0.17

0.016

1.018

19.52

8.0.16

0.003

1.031

19.52

8.0.15

0.017

1.022

19.52

8.0.14

0.013

1.028

19.52

8.0.13

0.003

1.033

19.52

8.0.12

0.013

1.022

19.52

8.0.11

0.007

1.028

19.52

8.0.10

0.020

1.016

19.52

8.0.9

0.007

1.033

19.52

8.0.8

0.003

1.029

19.52

8.0.7

0.017

1.016

19.52

8.0.6

0.013

1.021

19.52

8.0.5

0.010

1.023

19.52

8.0.3

0.020

1.017

19.52

8.0.2

0.023

1.007

19.52

8.0.1

0.010

1.025

19.52