如何在Linux系统中通过PHP脚本实现磁盘空间监测

function get_disk_space() {
    $output = shell_exec('df -h');
    $lines = explode("
", trim($output));
    $data = array();

    foreach ($lines as $line) {
        $cols = preg_split('/s+/', $line);
        if (sizeof($cols) > 1 && is_numeric($cols[1])) {
            $data[] = array(
                'filesystem' => $cols[0],
                'size' => $cols[1],
                'used' => $cols[2],
                'avail' => $cols[3],
                'percent' => $cols[4],
                'mounted' => $cols[5],
            );
        }
    }

    return $data;
}

$disk_space = get_disk_space();
print_r($disk_space);

function check_disk_space($threshold) {
    $disk_space = get_disk_space();
    
    foreach ($disk_space as $disk) {
        if (intval($disk['percent']) >= $threshold) {
            $message = "磁盘空间警报：文件系统 {$disk['filesystem']} 使用超过阈值 {$threshold}%";
            // 发送警报邮件或其他操作
            // ...
            echo $message . "
";
        }
    }
}

$threshold = 80; // 设置阈值为80%
check_disk_space($threshold);