Online PHP editor | perf for VFV2h

<?php $input = [ 'a', ['b', 'c'], 'd', ['e'], ['f', 'g'], ['h', 'i', ['j', ['k'], ['l', 'm', ['n']]]], 'o', 'p', ['q', 'r'], ['s', ['t', ['u', ['v']]]], 'w', 'x', 'y', 'z']; class TraversableInput implements \IteratorAggregate { public $input = [ 'a', ['b', 'c'], 'd', ['e'], ['f', 'g'], ['h', 'i', ['j', ['k'], ['l', 'm', ['n']]]], 'o', 'p', ['q', 'r'], ['s', ['t', ['u', ['v']]]], 'w', 'x', 'y', 'z']; function getIterator() { return new ArrayIterator($this->input); } } $input = new TraversableInput(); function flatten1($input) { return \array_reduce( (array) $input, function ($carry, $item) { return \is_array($item) ? \array_merge($carry, flatten1($item)) : \array_merge($carry, [$item]); }, [] ); } function flatten2($input) { $stack = [$input]; $result = []; while (!empty($stack)) { $item = array_shift($stack); if (is_array($item) || $item instanceof Traversable) { foreach ($item as $element) { array_unshift($stack, $element); } } else { array_unshift($result, $item); } } return $result; } $start = microtime(TRUE); for($x=0;$x<10000;$x++){ flatten1($input); }; $end = microtime(TRUE); $diff = $end-$start; $sec = intval($diff); $micro = $diff - $sec; $final = strftime('%T', mktime(0, 0, $sec)) . str_replace('0.', '.', sprintf('%.10f', $micro)); echo "Flatten1: " . $final . "\n"; $start = microtime(TRUE); for($x=0;$x<10000;$x++){ flatten2($input); }; $end = microtime(TRUE); $diff = $end-$start; $sec = intval($diff); $micro = $diff - $sec; $final = strftime('%T', mktime(0, 0, $sec)) . str_replace('0.', '.', sprintf('%.10f', $micro)); echo "Flatten2: " . $final . "\n";

Version	System time (s)	User time (s)	Memory (MiB)
7.3.1	0.020	0.302	16.61
7.3.0	0.013	0.301	16.73
7.2.13	0.026	0.319	16.89
7.2.12	0.037	0.342	16.77
7.2.11	0.017	0.308	16.82
7.2.10	0.140	0.312	15.51
7.2.9	0.203	0.329	15.82
7.2.8	0.158	0.329	15.73
7.2.7	0.143	0.312	16.16
7.2.6	0.138	0.315	16.06
7.2.5	0.158	0.331	15.79
7.2.4	0.192	0.358	15.72
7.2.3	0.183	0.376	15.85
7.2.2	0.215	0.362	15.72
7.2.1	0.200	0.383	15.60
7.2.0	0.182	0.317	16.08
7.1.25	0.010	0.481	15.48
7.1.22	0.420	0.485	13.87
7.1.21	0.319	0.402	13.84
7.1.20	0.250	0.360	13.61
7.1.19	0.310	0.331	13.66
7.1.18	0.273	0.340	13.97
7.1.17	0.394	0.489	13.77
7.1.16	0.383	0.484	13.74
7.1.15	0.351	0.390	14.04
7.1.14	0.321	0.446	13.80
7.1.13	0.363	0.441	13.52
7.1.12	0.338	0.541	13.88
7.1.11	0.377	0.497	13.82
7.1.10	0.338	0.486	14.16
7.1.9	0.470	0.409	13.95
7.1.8	0.411	0.401	13.89
7.1.7	0.429	0.394	13.64
7.1.6	0.439	0.446	31.96
7.1.5	0.653	0.431	31.99
7.1.4	0.659	0.425	31.40
7.1.3	0.635	0.439	32.01
7.1.2	0.715	0.473	31.80
7.1.1	0.586	0.526	13.70
7.1.0	0.387	0.351	13.99