Online PHP editor | perf for 3db8j

<?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( $input, function ($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)
7.2.10	0.108	0.007	14.38
7.2.9	0.093	0.009	14.76
7.2.8	0.106	0.010	14.53
7.2.7	0.120	0.013	14.89
7.2.6	0.102	0.013	14.95
7.2.5	0.079	0.009	14.73
7.2.4	0.090	0.013	14.95
7.2.3	0.118	0.003	14.95
7.2.2	0.081	0.014	14.89
7.2.1	0.140	0.009	14.93
7.2.0	0.079	0.000	15.13
7.1.22	0.088	0.015	13.75
7.1.21	0.084	0.003	13.83
7.1.20	0.064	0.016	13.75
7.1.19	0.078	0.007	13.67
7.1.18	0.131	0.010	13.84
7.1.17	0.121	0.003	13.73
7.1.16	0.103	0.007	14.02
7.1.15	0.111	0.007	13.73
7.1.14	0.071	0.009	13.61
7.1.13	0.215	0.003	13.86
7.1.12	0.096	0.009	13.93
7.1.11	0.066	0.007	13.83
7.1.10	0.077	0.010	13.89
7.1.9	0.102	0.007	13.70
7.1.8	0.110	0.012	13.76
7.1.7	0.077	0.000	13.84
7.1.6	0.116	0.007	31.85
7.1.5	0.111	0.016	31.83
7.1.4	0.084	0.013	31.98
7.1.3	0.139	0.019	31.73
7.1.2	0.158	0.003	31.79
7.1.1	0.121	0.003	13.66
7.1.0	0.114	0.013	13.87