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HomeBackend DevelopmentPHP Tutorial用PHP实现小型站点广告管理_PHP

本例在PHP4 MySQL Apache for Win9x/2000下调试通过,共包括两部分:用来增加新广告的程序AddNewAd.php3以及显示广告的程序ShowAd.php3,都存放在服务器PHP文件目录下的“test/guanggao/”目录中。在guanggao目录中建立一个存放广告链接图片的子目录“adbanner/”。下面我们按步骤进行分析。
  
  1.首先,建立MySQL数据库:guanggao
  
  在Windows环境下,建立一个MySQL空数据库很简单,因为每个数据库都是存在于mysql/data/目录下的一个子目录,所以只要在该目录下新建子目录guanggao就可以了,这时数据库内还没有任何表和数据。
  
  2.建立新增广告程序:AddNewAd.php3
  
  设计思路:其中先用表单得到用户的新广告信息;然后用PHP函数copy()将链接图片(banner)文件上传到服务器adbanner目录下;最后将图片文件名、广告网址、说明、加权信息等写入建立的MySQL数据表ad中。该程序代码如下:
  
  # AddNewAd.php3——增添新的广告 #
  

增添新广告


  //表单用来输入新增广告信息,并交给下面的PHP程序处理;
  //其中,加权值priority数字愈大,载入页面图片出现的机率就愈高,默认为1。
  

  广告 Banner:

  广告网址URL:

  图片链接说明ALT:

  显示加权:

  
  

  //处理表单数据的PHP程序;
    //图片banner名和链接地址不能为空;
  if (( banner!="") & ( url!="")) {
  //若广告链接和图片名已被使用,必须另选;
  if (file_exists("adbanner/". banner_name)) {
  echo "广告图片. banner_name.已被使用,请另选!";
  exit;
  };
  //上传链接图片文件名到adbanner目录;
  copy( banner,"adbanner/". banner_name);
  //连接MySQL数据库;
  connection = mysql_connect();
  //选择数据源guanggao,执行查询;;
  mysql_select_db("guanggao", );
  query="SELECT * FROM ad";
  result=mysql_query( query);
  //如果数据表ad不存在,则按以下结构创建新数据表ad;
  if(!result){
  mysql_query("
  create table ad(
  url varchar(100) not null,
  banner varchar(150) not null,
  alt varchar(100) null,
  priority tinyint(4) default 1 not null
  )") or die(mysql_error());
  }
  //向数据表ad中插入来自于表单的新数据;
  query="insert into ad(url, banner, alt, priority) values( url, banner_name,
  alt, priority)";
  //插入成功则显示以下信息;
  try=mysql_query( query);
  if( try){
  echo "一条广告新增完成,详细信息:
  ";
  echo ". alt.
";
  echo "广告网址: url
广告链接说明: alt
显示加权: priority ";
  }
  }
  ?>
  
  3.建立显示广告程序:ShowAd.php3
  
  设计思路:得到数据库表中所有各列信息分别存到相应的一维数组中,将所有广告的权值相加得到一个最大随机数,每次载入页面用srand() 产生一个随机树种子,再用rand()函数产生一个从1到最大随机数之间的一个随机数,然后按照一定的规则随机显示不同广告条,权值越大被显示的机会越大。
  
  # ShowAd.php3——随机显示广告 #
    //连接选择数据库;
  connection = mysql_connect();
  mysql_select_db("guanggao", connection);
  //执行查询得到广告条数;
  query="SELECT url, banner, alt, priority FROM ad where priority > 0";
  result=mysql_db_query("guanggao", query);
  numrows=mysql_num_rows( result);
  //使用mysql_fetch_object()函数获取有用的列信息并存到相应数组中;
  while( row = mysql_fetch_object( result)) {
  adurl[]= row->url;
  adbanner[]= row->banner;
  adalt[]= row->alt;
  adpriority[]= row->priority;
  }
  //初始化中间变量;
  numcheck= numrows;
  i= pricount=0;
  //得到最大随机数;
  while( numcheck) {
  pricount = adpriority[ i];
  i ; numcheck--;
  }
  //程序执行时的百万分之一秒产生随机数种子;
  srand((double)microtime()*1000000);
  //得到1到最大随机数之间的一个随机数;
  pri = rand(1, pricount);
  //中间变量清零;
  pricount=0;
  //按加权值不同,产生用来显示广告的、元素为字串的数组;
  for( i=0; i  pricount = adpriority[ i];
  if ( pri   ad[]="";
  }
  }
  //显示广告,权值越大,显示机会越大;
  echo ad[0];
  ?>
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