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switch($_GET['step']){
    case '1': //安装许可协议
		include ABS_PATH."/step/step1.php";
	break;
    case '2': //检查安装环境是否满足要求
		$PHP_GD  = '';
		if(extension_loaded('gd')) {
			if(function_exists('imagepng')) $PHP_GD .= 'png';
			if(function_exists('imagejpeg')) $PHP_GD .= ' jpg';
			if(function_exists('imagegif')) $PHP_GD .= ' gif';
		}
		$PHP_JSON = '0';
		if(extension_loaded('json')) {
			if(function_exists('json_decode') && function_exists('json_encode')) $PHP_JSON = '1';
		}
		//新加fsockopen 函数判断,此函数影响安装后会员注册及登录操作。
		if(function_exists('fsockopen')) {
			$PHP_FSOCKOPEN = '1';
		}
		$PHP_DNS = preg_match("/^[0-9.]{7,15}$/", @gethostbyname('www.baidu.cn')) ? 1 : 0;
		//是否满足FengCms安装需求
		$is_right = (phpversion() >= '5.2.0' && extension_loaded('mysql') && $PHP_JSON && $PHP_GD && $PHP_FSOCKOPEN) ? 1 : 0;
		//配置文件是否存在和可写
		$is_config = (is_readable($config_file) && is_writable($config_file)) ? 1 : 0;
		//上传目录是否可写
		$is_upload = (dir_writeable(ROOT_PATH."/upload")) ? 1 : 0;
		
		//模块导出目录是否可写
		$is_module = (dir_writeable(ROOT_PATH."https://wooyun-img.oss-cn-beijing.aliyuncs.com/upload/module")) ? 1 : 0;
		//前台缓存目录是否可写
		$is_cache = (dir_writeable(ROOT_PATH."/app/cache")) ? 1 : 0;
		include ABS_PATH."/step/step2.php";
	break;
    case '3': //填写数据库信息
		include ABS_PATH."/step/step3.php";
	break;
    case '4': //正在安装
		$conn=@mysql_connect($_GET['host'],$_GET['user'],$_GET['password']);
		if(!$conn){
				echo '<script type="text/javascript">alert("链接主机失败，请检查主机地址、用户名和密码是否正确！");history.go(-1);</script>';
				exit();  
		}elseif(intval(mysql_get_server_info($conn))<5){
				echo '<script type="text/javascript">alert("您的MYSQL版本为'. mysql_get_server_info($conn).'，版本太低，不能安装FengCms!");history.go(-1);</script>';
				exit();  
		}else{  
			if(!mysql_select_db($_GET['dbname'],$conn)){   //如果数据库不存在，我们就进行创建。
				if (!mysql_query("CREATE DATABASE ". $_GET['dbname'] ." default character set utf8;",$conn))
					{
					
						echo '<script type="text/javascript">alert("数据库不存在，创建不成功");history.go(-1);</script>';
					}else{
						if(!mysql_select_db($_GET['dbname'],$conn)){
							
							echo '<script type="text/javascript">alert("链接数据库失败，请检查数据库是否正确！");history.go(-1);</script>';
						}else{
							include "data.php";
					}
				}
			}else{
				include "data.php";
		   }
		}
	break;
    case '5': //安装完成
		include ABS_PATH."/step/step5.php";
	break;
    case '6': //删除安装目录
		if(rmdirs(ROOT_PATH.'/install') or rmdir(ROOT_PATH.'/install')){
			  echo '<script type="text/javascript">alert("删除成功！");close();</script>';
			  exit();
		}else{
			  echo '<script type="text/javascript">alert("删除失败，请手工删除网站根目录下install目录！");close();</script>';
			  exit();
		}
	break;
}