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header("Content-type: text/html; charset=utf-8"); //申明编码,以免页面乱码

//去掉内容中所有空格:
$qian=array(" "," ","\t","\n","\r");
$hou=array("","","","","");
$data['name']=str_replace($qian,$hou,$str);    

gethostbyname($_ENV['COMPUTERNAME'])//获取本机IP:

//全部转为大写字母
strtoupper()

 $_SERVER['HTTP_REFERER'];//获取上一页的URL地址
 
 获得用户IP
function getIpAddress() 
{ // 取得当前用户的IP地址 
if (getenv('HTTP_CLIENT_IP')) 
{ $ip = getenv('HTTP_CLIENT_IP'); }
 elseif (getenv('HTTP_X_FORWARDED_FOR'))
  { $ip = getenv('HTTP_X_FORWARDED_FOR'); } 
  elseif (getenv('REMOTE_ADDR')) 
  { $ip = getenv('REMOTE_ADDR'); } else
  { $ip = $_SERVER['REMOE_ADDR']; }  
  return $ip;}
 
//过滤数组中为空的值
array_filter()


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