/** * 记录和统计时间(微秒)和内存使用情况 * 使用方法: * * G('begin'); // 记录开始标记位 * // ... 区间运行代码 * G('end'); // 记录结束标签位 * echo G('begin','end',6); // 统计区间运行时间 精确到小数后6位 * echo G('begin','end','m'); // 统计区间内存使用情况 * 如果end标记位没有定义,则会自动以当前作为标记位 * 其中统计内存使用需要 MEMORY_LIMIT_ON 常量为true才有效 * * @param string $start 开始标签 * @param string $end 结束标签 * @param integer|string $dec 小数位或者m * @return mixed */ function G($start,$end='',$dec=4) { static $_info = array(); static $_mem = array(); if(is_float($end)) { // 记录时间 $_info[$start] = $end; }elseif(!empty($end)){ // 统计时间和内存使用 if(!isset($_info[$end])) $_info[$end] = microtime(TRUE); if(MEMORY_LIMIT_ON && $dec=='m'){ if(!isset($_mem[$end])) $_mem[$end] = memory_get_usage(); return number_format(($_mem[$end]-$_mem[$start])/1024); }else{ return number_format(($_info[$end]-$_info[$start]),$dec); } }else{ // 记录时间和内存使用 $_info[$start] = microtime(TRUE); if(MEMORY_LIMIT_ON) $_mem[$start] = memory_get_usage(); } }

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