mysql执行时间为负数的原因分析_MySQL:bitsCN.com list($usec, $sec) = explode(' ', microtime()); $timer = (float)$usec + (float)$sec; mysql_query($query, $active_db); list($usec, $sec) = explode(' ', microtime()); $stop = (float)$usec + (float)$sec; $diff = $stop - $timer; > $