PHP计算程序执行耗时及内存占用

用到的函数

计算当前时间戳的函数

/**
 * 当前时间戳
 * @return mixed|string
 */
function _runtime(){
    $mtime = microtime();
    $time = explode(' ', $mtime);
    return $time[1]+$time[0];
}

格式化时间函数

function formatTime($time){
    if(is_numeric($time)){
        $value = array(
            "years" => 0, "days" => 0, "hours" => 0,
            "minutes" => 0, "seconds" => 0,
        );
        if($time >= 31556926){
            $value["years"] = floor($time/31556926);
            $time = ($time%31556926);
        }
        if($time >= 86400){
            $value["days"] = floor($time/86400);
            $time = ($time%86400);
        }
        if($time >= 3600){
            $value["hours"] = floor($time/3600);
            $time = ($time%3600);
        }
        if($time >= 60){
            $value["minutes"] = floor($time/60);
            $time = ($time%60);
        }
        $value["seconds"] = floor($time);
        //return (array) $value;
        $t="";
        if(!empty($value['years'])){
            $t.=$value["years"] ."年";
        }
        if(!empty($value["days"])){
            $t.=$value['days']."天";
        }
        if(!empty($value["hours"])){
            $t.=$value['hours']."小时";
        }
        if(!empty($value["minutes"])){
            $t.=$value['minutes']."分";
        }
        $t.=$value["seconds"]."秒";
        return $t;
    }else{
        return FALSE;
    }
}

格式化字节函数

function formatSize($bytes) {
    $units = [' B', ' KB', ' MB', ' GB', ' TB'];
    for ($i = 0; $bytes >= 1024 && $i < 4; $i++) $bytes /= 1024;
    return round($bytes, 2) . $units[$i];
}

计算程序消耗的时间

function expendTime($startTime){
    return formatTime(_runtime() - $startTime);
}

计算程序消耗的内存

function expendMemory($startMemory){
    return formatSize(memory_get_usage() - $startMemory);
}

计算内存峰值

function maxMemory()
{
    return formatSize(memory_get_peak_usage());
}

在程序开头记录当前时间及内存

define('START_TIME', _runtime());
define('START_MEMORY', memory_get_usage());

程序结束后计算耗时及内存占用情况

echo '执行耗时：[ ' . expendTime(START_TIME) . ' ]， 内存：[ ' . expendMemory(START_MEMORY) . ' ]， 内存峰值：[ ' . maxMemory() . ' ]' . "\r\n";