php记录服务器负载、内存、cpu状态的代码

<?php  
/**
* 记录服务器负载、内存使用、cpu状态
* 每10秒检测一次
* edit by bbs.it-home.org
*/
while(1){  
    exec('top -b -n 1 -d 3',$out);  
    $Cpu = explode('  ', $out[2]);  
    $Mem = explode('  ', $out[3]);  
    $Swap = explode('  ', $out[4]);  
    //var_dump($Cpu,$Mem,$Swap);  
      
    $cpu = str_replace(array('%us,',' '),'',$Cpu[1]);  
    $mem = str_replace(array('k used,',' '),'',$Mem[2]);  
    $swap = str_replace(array('k cached',' '),'',$Swap[5]);  
    echo date('md H').' '.$cpu.'    '.intval($mem/1024).'   '.intval($swap/1024).chr(10);  
    sleep(10);  
}
?>