Online PHP editor | refs for 577TT

<?php function formatMemoryUsage($usage) { $unit = array(' B', 'kB', 'MB', 'GB', 'TB'); $factor = floor((strlen($usage) - 1) / 3); return sprintf('%.2f %s (%d bytes) ', $usage / pow(1024, $factor), $unit[$factor], $usage); } for($size = 1000; $size < 100000; $size *= 2) { echo PHP_EOL . '> Testing size: ' . number_format($size) . PHP_EOL; echo ' Array()' . PHP_EOL; for($s = microtime(true), $m = memory_get_usage(true), $container = Array(), $i = 0; $i < $size; $i++) $container[$i] = null; echo ' - Write - time : ' . str_pad(microtime(true) - $s, 20, '0') . ' - memory: ' . formatMemoryUsage(memory_get_usage(true) - $m) . PHP_EOL; $s = microtime(true); foreach ($container as $key => $value) { $void = $value; } echo ' - Read - time : ' . str_pad(microtime(true) - $s, 20, '0') . PHP_EOL; unset($container); echo ' SplFixedArray()' . PHP_EOL; for($s = microtime(true), $m = memory_get_usage(true), $container = new SplFixedArray($size), $i = 0; $i < $size; $i++) $container[$i] = null; echo ' - Write - time : ' . str_pad(microtime(true) - $s, 20, '0') . ' - memory: ' . formatMemoryUsage(memory_get_usage(true) - $m) . PHP_EOL; $s = microtime(true); foreach ($container as $key => $value) { $void = $value; } echo ' - Read - time : ' . str_pad(microtime(true) - $s, 20, '0') . PHP_EOL; unset($container); }