PHP 函数在监控和告警系统中的应用场景

$output = exec('uptime');echo "<div>$output</div>";

$messages = file('error.log');foreach ($messages as $message) {    if (preg_match('/level=error/', $message)) {        // Handle error message    }}

$headers = 'From: noreply@example.com' . "" .    'Reply-To: devops@example.com' . "" .    'X-Mailer: PHP/' . phpversion();mail('admin@example.com', 'Alert: Critical Error', 'An error has occurred...', $headers);

// 每 5 分钟执行监控脚本schedule_task('monitor', '*/5 * * * *', function () {    // 获取服务器状态    $cpuUsage = exec('uptime | cut -d "," -f 3 | cut -d ":" -f 2');    $memUsage = exec('free -m | grep Mem | awk '{print $3/$2 * 100}'');    $diskUsage = exec('df -h | grep -m 1 / | awk '{print $5}'');    // 生成电子邮件警报    $content = "CPU Usage: $cpuUsage%Memory Usage: $memUsage%Disk Usage: $diskUsage%";    mail('admin@example.com', 'Server Status Alert', $content);});