Online PHP editor | refs for kKf60

<?php function check_unique() { $seen = new ArrayObject(); return function ($value) use ($seen) { if (in_array($value, (array)$seen)) { return false; } $seen[] = $value; return true; }; } const ITEMS = 1000; $array = array_merge(range(1, ITEMS, 3), range(1, ITEMS, 2)); echo "started with ", count($array), " items\n"; $check_unique = check_unique(); $unique = []; echo "memory usage ", memory_get_peak_usage(), "\n"; $time = -microtime(true); foreach ($array as $value) { if ($check_unique($value)) { $unique[] = $value; } } $time += microtime(true); echo "memory usage ", memory_get_peak_usage(), "\n"; echo "took $time sec\n"; echo "finished with ", count($unique), " items\n";