How to implement disk space monitoring through PHP script in Linux system

How to implement disk space monitoring through PHP scripts in Linux systems

Introduction:
Disk space monitoring is a very important task in system management. For Linux systems, we can implement automated disk space monitoring by writing PHP scripts. This article will introduce how to use PHP to obtain disk information, make judgments and alarms based on set thresholds, and provide specific code examples.

Step 1: Obtain disk information through PHP
To obtain disk information, we can use the shell command df of the Linux system. The following is an example of a PHP function that obtains disk information and prints it:

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);

In the above code, the df -h command is executed through the shell_exec function to obtain the disk information, and the results are divided by lines. Then, by looping through each row, use regular expressions to split the data of each row into an array and filter out the data with disk information. Finally, an array containing all disk information is returned.

Step 2: Judgment and alarm based on threshold value
In disk space monitoring, we usually set a threshold. When the disk usage space exceeds the threshold, an alarm needs to be issued in time. The following is an example function for judgment and alarm:

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);

In the above code, we obtain disk information by calling the get_disk_space function. Then, traverse the disk information array, use the intval function to convert the disk usage percentage into an integer, and compare it with the set threshold. If the threshold is exceeded, an alert action is triggered, such as sending an alert email or performing other actions for disk space alerts.

Summary:
By writing the above code, we can use PHP scripts to monitor disk space in Linux systems. First, we call the df command through the shell_exec function to obtain the disk information, parse and save it into an array. Then, by setting the threshold, it is judged whether the set warning line is exceeded and the corresponding alarm operation is triggered. This method can help system administrators monitor disk space in a timely manner and prevent problems caused by insufficient disk space.

Note: The above code examples are for reference only, please make appropriate adjustments according to specific needs and environment.

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