php 获得linux 机器的性能

<?php $str = shell_exec('more /proc/stat');$pattern = "/(cpu[0-9]?)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)/";preg_match_all($pattern, $str, $out);echo "共有".count($out[1])."个CPU，每个CPU利用率如下：\n";for($n=0;$n<count($out[1]);$n++){echo $out[1][$n]."=".(100*($out[1][$n]+$out[2][$n]+$out[3][$n])/($out[4][$n]+$out[5][$n]+$out[6][$n]+$out[7][$n]))."%\n";}$str = shell_exec('more /proc/meminfo');$pattern = "/(.+):\s*([0-9]+)/";preg_match_all($pattern, $str, $out);echo "物理内存总量：".$out[2][0]."\n";echo "已使用的内存：".$out[2][1]."\n";echo "-----------------------------------------\n";echo "内存使用率：".(100*($out[2][0]-$out[2][1])/$out[2][0])."%\n";$str = shell_exec('more /proc/net/dev');$pattern = "/(eth[0-9]+):\s*([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)\s+([0-9]+)/";preg_match_all($pattern, $str, $out);echo "共有".count($out[1])."个网络接口，每个网络接口利用率如下：\n";for($n=0;$n<count($out[1]);$n++){echo $out[1][$n]."：收到 ".$out[3][$n]." 个数据包，发送 ".$out[11][$n]." 个数据包\n";}function get_cpu_usg(){     $str = shell_exec('more /proc/stat');     $pattern = "/(cpu[0-9]?)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)[\s]+([0-9]+)/";     preg_match_all($pattern, $str, $out);     $total=0;     for($n=0;$n<count($out[1]);$n++)     {                $usg=(100*($out[1][$n]+$out[2][$n]+$out[3][$n])/($out[4][$n]+$out[5][$n]+$out[6][$n]+$out[7][$n]));               $total+=$usg;      }     return $total;}function get_mem_usg(){     $str = shell_exec('more /proc/meminfo');     $pattern = "/(.+):\s*([0-9]+)/";     preg_match_all($pattern, $str, $out);     $memusg= (100*($out[2][0]-$out[2][1])/$out[2][0]) ;     return $memusg;}