Online PHP editor | refs for bOdXP

<?php $cnt = 1000; $strs = [ 'empty' => '', 'short' => 'zluty kun', 'short_with_uc' => 'zluty Kun', 'long' => str_repeat('this is about 10000 chars long string', 270), 'long_with_uc' => str_repeat('this is about 10000 chars long String', 270), 'short_utf8' => 'žlutý kůň', 'short_utf8_with_uc' => 'Žlutý kŮň', ]; foreach ($strs as $k => $str) { $a1 = microtime(true); for($i=0; $i < $cnt; ++$i){ $res = strtolower($str); } $t1 = microtime(true) - $a1; // echo 'it took ' . round($t1 * 1000, 3) . ' ms for ++$i'."\n"; $a2 = microtime(true); for($i=0; $i < $cnt; $i++){ $res = mb_strtolower($str); } $t2 = microtime(true) - $a2; // echo 'it took ' . round($t2 * 1000, 3) . ' ms for $i++'."\n"; echo 'strtolower is '.round($t2/$t1, 2).'x faster than mb_strtolower for ' . $k . "\n\n"; }