<?php class a {} $a = new a; $start = microtime(1);for ($i=0;$i<10000000;$i++) {if (null === $a) {}} echo (microtime(1) - $start)*1000; echo "\n"; $start = microtime(1);for ($i=0;$i<10000000;$i++) {if ($a) {}} echo (microtime(1) - $start)*1000; echo "\n"; $start = microtime(1);for ($i=0;$i<10000000;$i++) {if ($a instanceof a) {}} echo (microtime(1) - $start)*1000; echo "\n";
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