PHP Server load Judgment

<?php  Header ("Content-type:text/html;charset=utf-8");//Echo php_os;exit;//echo get_server_load (); var_dump (Sys_getloadavg ());/* $load = Sys_getloadavg (), if ($load [0] >) {    header (' http/1.1 503 Too Busy, try again later ') ;    Die (' Server too busy. Please try again later. ');} *///recommends that the maximum load not exceed the 3*n core, such as 16 cores (with 8 core Hyper-threading), then 16*3=48function get_server_load () {    if (stristr (Php_os, ' win ')) {            $wmi = New COM ("winmgmts://");        $server = $wmi->execquery ("Select Loadpercentage from Win32_Processor");                $cpu _num = 0;        $load _total = 0;                foreach ($server as $cpu) {            $cpu _num++;            $load _total + = $cpu->loadpercentage;        }                $load = Round ($load _total/$cpu _num);            } else {            $sys _load = Sys_getloadavg ();        $load = $sys _load[0];        }        return (int) $load;}

　　

PHP Server load Judgment