简单的linux下的php获取服务器状态的代码，不多说-直接上函数：

 function get_used_status(){
  $fp = popen('top -b -n 2 | grep -E "^(Cpu|Mem|Tasks)"',"r");//获取某一时刻系统cpu和内存使用情况
  $rs = "";
  while(!feof($fp)){
   $rs .= fread($fp,1024);
  }
  pclose($fp);
  $sys_info = explode("n",$rs);

  $tast_info = explode(",",$sys_info[3]);//进程 数组
  $cpu_info = explode(",",$sys_info[4]);  //CPU占有量  数组
  $mem_info = explode(",",$sys_info[5]); //内存占有量 数组

  //正在运行的进程数
  $tast_running = trim(trim($tast_info[1],'running'));
  //CPU占有量
  $cpu_usage = trim(trim($cpu_info[0],'Cpu(s): '),'%us');  //百分比
  
  //内存占有量
  $mem_total = trim(trim($mem_info[0],'Mem: '),'k total'); 
  $mem_used = trim($mem_info[1],'k used');
  $mem_usage = round(100*intval($mem_used)/intval($mem_total),2);  //百分比
  

  /*硬盘使用率 begin*/
  $fp = popen('df -lh | grep -E "^(/)"',"r");
  $rs = fread($fp,1024);
  pclose($fp);
  $rs = preg_replace("/s{2,}/",' ',$rs);  //把多个空格换成 “_”
  $hd = explode(" ",$rs);
  $hd_avail = trim($hd[3],'G'); //磁盘可用空间大小 单位G
  $hd_usage = trim($hd[4],'%'); //挂载点 百分比
  //print_r($hd);
  /*硬盘使用率 end*/  
  
  //检测时间
  $fp = popen("date +"%Y-%m-%d %H:%M"","r");
  $rs = fread($fp,1024);
  pclose($fp);
  $detection_time = trim($rs);
  
  /*获取IP地址  begin*/
  /*
  $fp = popen('ifconfig eth0 | grep -E "(inet addr)"','r');
  $rs = fread($fp,1024);
  pclose($fp);
  $rs = preg_replace("/s{2,}/",' ',trim($rs));  //把多个空格换成 “_”
  $rs = explode(" ",$rs);
  $ip = trim($rs[1],'addr:');
  */
  /*获取IP地址 end*/
  /*
  $file_name = "/tmp/data.txt"; // 绝对路径: homedata.dat 
  $file_pointer = fopen($file_name, "a+"); // "w"是一种模式，详见后面
  fwrite($file_pointer,$ip); // 先把文件剪切为0字节大小， 然后写入
  fclose($file_pointer); // 结束
  */
  
  return  array('cpu_usage'=>$cpu_usage,'mem_usage'=>$mem_usage,'hd_avail'=>$hd_avail,'hd_usage'=>$hd_usage,'tast_running'=>$tast_running,'detection_time'=>$detection_time);
 }