php 源代码之获取用户操作系统类型

编辑代码

<?php
  $viewer = getenv( "HTTP_USER_AGENT" );

  $platform = "an unidentified operating system";
  if( preg_match( "/Windows/i", "$viewer")){ 
     $platform = "Windows"; 
  }else if( preg_match( "/Linux/i", "$viewer")){ 
     $platform = "Linux"; 
  }
  echo( "你的操作系统类型是：$platform" );
 
?>