PHP 之獲取Windows下CPU、內存的使用率

<?php
/**
 * Created by PhpStorm.
 * User: 25754
 * Date: 2019/5/4
 * Time: 13:42
 */

class SystemInfoWindows
{
    /**
     * 判斷指定路徑下指定文件是否存在，如不存在則建立
     * @param string $fileName 文件名
     * @param string $content 文件內容
     * @return string 返回文件路徑
     */
    private function getFilePath($fileName, $content)
    {
        $path = dirname(__FILE__) . "\\$fileName";
        if (!file_exists($path)) {
            file_put_contents($path, $content);
        }
        return $path;
    }

    /**
     * 得到cpu使用率vbs文件生成函數
     * @return string 返回vbs文件路徑
     */
    private function getCupUsageVbsPath()
    {
        return $this->getFilePath(
            'cpu_usage.vbs',
            "On Error Resume Next
    Set objProc = GetObject(\"winmgmts:\\\\.\\root\cimv2:win32_processor='cpu0'\")
    WScript.Echo(objProc.LoadPercentage)"
        );
    }

    /**
     * 得到總內存及可用物理內存JSON vbs文件生成函數
     * @return string 返回vbs文件路徑
     */
    private function getMemoryUsageVbsPath()
    {
        return $this->getFilePath(
            'memory_usage.vbs',
            "On Error Resume Next
    Set objWMI = GetObject(\"winmgmts:\\\\.\\root\cimv2\")
    Set colOS = objWMI.InstancesOf(\"Win32_OperatingSystem\")
    For Each objOS in colOS
     Wscript.Echo(\"{\"\"TotalVisibleMemorySize\"\":\" & objOS.TotalVisibleMemorySize & \",\"\"FreePhysicalMemory\"\":\" & objOS.FreePhysicalMemory & \"}\")
    Next"
        );
    }

    /**
     * 得到CPU使用率
     * @return Number
     */
    public function getCpuUsage()
    {
        $path = $this->getCupUsageVbsPath();
        exec("cscript -nologo $path", $usage);
        return $usage[0];
    }

    /**
     * 得到內存使用率數組
     * @return array
     */
    public function getMemoryUsage()
    {
        $path = $this->getMemoryUsageVbsPath();
        exec("cscript -nologo $path", $usage);
        $memory = json_decode($usage[0], true);
        $memory['usage'] = Round((($memory['TotalVisibleMemorySize'] - $memory['FreePhysicalMemory']) / $memory['TotalVisibleMemorySize']) * 100);
        return $memory;
    }
}