如何使用PHP编写Linux脚本进行系统性能监测

php -v

<?php

// 获取系统CPU使用率
function getCpuUsage() {
    $output1 = shell_exec("cat /proc/stat | grep cpu");
    sleep(1);
    $output2 = shell_exec("cat /proc/stat | grep cpu");
    
    $cpus = explode("
", $output1);
    $cpu1 = explode(" ", $cpus[0]);
    $cpu2 = explode(" ", $output2);
    
    $totalCpu1 = $cpu1[1] + $cpu1[2] + $cpu1[3] + $cpu1[4];
    $totalCpu2 = $cpu2[1] + $cpu2[2] + $cpu2[3] + $cpu2[4];
    $usage = ($totalCpu2 - $totalCpu1) / ($totalCpu2 + $cpu2[5] - $totalCpu1 + $cpu1[5]) * 100;
    
    return round($usage, 2);
}

// 获取内存使用情况
function getMemoryUsage() {
    $output = shell_exec("free -m | grep Mem");
    $memory = explode(" ", $output);
    
    $total = $memory[1];
    $used = $memory[2];
    $usage = $used / $total * 100;
    
    return round($usage, 2);
}

// 获取磁盘使用情况
function getDiskUsage() {
    $output = shell_exec("df -h --total | tail -n 1");
    $usage = explode(" ", $output);
    
    return $usage[4];
}

// 打印系统性能信息
function printSystemPerformance() {
    $cpuUsage = getCpuUsage();
    $memoryUsage = getMemoryUsage();
    $diskUsage = getDiskUsage();
    
    echo "CPU使用率: ".$cpuUsage."%
";
    echo "内存使用率: ".$memoryUsage."%
";
    echo "磁盘使用情况: ".$diskUsage."
";
}

// 调用函数获取并打印系统性能信息
printSystemPerformance();

?>

php performance.php