Online PHP editor | refs 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";