linux环境下 php获取主机IP

<?php
 public static function get_my_ips()
 {
  　　$ip_list = array();
      $command = "/sbin/ifconfig | grep 'inet' | grep -v '127.0.0.1' | while read line; do echo \"\$line\" | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -n 1; done";
      exec($command, $ip_list);

      return $ip_list;
  }
?>