php 怎么判断用户登录了

<?php这是一个简单的例子
if(!isset($_GET['logout'])){
     session_start();
     if(!isset($_SESSION['adminname']) or ($_SESSION['adminagent']!=md5($_SERVER['HTTP_USER_AGENT']))){
      header('location:/admin/');
      exit();
     }
}
else{
 $_SESSION=array();
 session_destroy();
 setcookie(session_name(),'',time()-300,'/','',0);
 header('location:index.php');
 exit();
}
?>

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?***.com/.*$ [NC]
RewriteRule .(gif|jpg|jpeg|png|rar|zip|mp3|wma|swf)$ - [F]

<?php
/*
  后台管理框架配置
  author:xqbar
  datetime:2008-3-29
*/
$toplink=array(0=>'账号管理','新闻管理','店铺管理','系统管理','友情链接');
$leftnav=array(
                0=>'账号管理|退出系统',
                   '新闻管理|新闻分类|退出系统',
                   '店铺管理|店铺分类|模板管理|退出系统',
                   '分类管理|地域管理|模板管理|退出系统',
                   '友情链接|退出系统'
               );
$leftlink=array(
                0=>'<a href="test/test.php" target="mainFrame">管理员</a>&nbsp;<a href="test/test.php" target="mainFrame">店铺会员</a>|<a href="checklogin.php?logout=ok" target="_top">退出管理</a>',
                   '<a href="test/test.php" target="mainFrame">所有新闻</a>&nbsp;<a href="test/test.php" target="mainFrame">添加新闻</a>@<a href="test/test.php" target="mainFrame">生成文件</a>|<a href="test/test.php" target="mainFrame">资讯分类</a>|<a href="checklogin.php" target="_top">退出管理</a>',
                   '<a href="test/test.php" target="mainFrame">所有店铺</a>&nbsp;<a href="test/test.php" target="mainFrame">添加店铺</a>|<a href="class/test.php" target="mainFrame">店铺分类</a>|<a href="test/test.php" target="mainFrame">模板列表</a>&nbsp;<a href="class/mbadd.php" target="mainFrame">添加模板</a>|<a href="checklogin.php?logout=ok" target="_top">退出管理</a>',
                   '<a href="test/test.php" target="mainFrame">新闻分类</a>&nbsp;<a href="test/test.php" target="mainFrame">店铺分类</a>|<a href="test/test.php" target="mainFrame">地域管理</a>|<a href="test/test.php" target="mainFrame">模板列表</a>&nbsp;<a href="test/test.php" target="mainFrame">添加模板</a>|<a href="checklogin.php?logout=ok" target="_top">退出管理</a>',
                   '<a href="test/test.php" target="mainFrame">连接列表</a>&nbsp;<a href="test/test.php" target="mainFrame">添加连接</a>|<a href="checklogin.php?logout=ok" target="_top">退出管理</a>'
               );                  
function topnav()
{
 global $toplink;
 $itemnum=count($toplink);
 echo '<div id="admin_header">';
 echo '<div id="admin_logo"></div>';
 echo '<div id="admin_nav">';
    echo '<ul>';
 foreach ($toplink as $key=>$value){echo "<li id='navli{$key}'><a href='javascript:navBar({$key},{$itemnum});'>$value</a></li>";}
 echo '</ul>';
 echo '</div>';
 echo '</div>';
 echo '</div>';
}
function leftnav($itemid)
{
 global $leftnav,$leftlink;
 $navtitle=explode('|',$leftnav[$itemid]);
 $navlink=explode('|',$leftlink[$itemid]);
 echo "<div id='admin_left'>";
 foreach ($navtitle as $key=>$value)
 {
  echo "<div class='navlist'>";
  echo "<h1 id='navtitle{$key}'><a href='javascript:nav({$key})'>{$value}</a></h1>";
  echo "<ul id='navlist{$key}'>";
  if(strlen(strstr($navlink[$key],"@"))>0){
   $itemlink=explode('@',$navlink[$key]);
   foreach($itemlink as $link){echo "<li>{$link}</li>";}
  }else{echo "<li>$navlink[$key]</li>";}
  echo "</ul>";
  echo "</div>";
 }
 echo "</div>";
}
if(isset($_GET['cpp'])){
 leftnav($_GET['cpp']);
}
?>

<?php
PHP代码:

<?php
$page_info = count_page($total , PER_PAGE );//分页参数
 $smarty->assign('page_first' , $page_info['page_first']);
 $smarty->assign('page_last' , $page_info['page_last']);
 $smarty->assign('page_str' , $page_info['page_str']);
 $sql = "SELECT * FROM `news` ORDER BY `id` DESC LIMIT {$page_info['offset']} , " . PER_PAGE;
?>

//PAGE : $total总页数   $per每页显示条数  $show 列表条数
function count_page($total = 0 , $per )
{
$page_out = array(
   'page_first' => '',  //首页
   'page_last'  => '',  //末页
   'page_str'  => '' ,  //分页
   'now_page'  => 1 ,  //当前页
   'offset'  => 0,  //偏移量
   );
$page_count = ceil($total / $per); //总页数
if($page_count <= 1){
  return $page_out;
}
$page_out['now_page'] = @$_GET['page'] + 0;
if($page_out['now_page'] < 1){
  $page_out['now_page'] = 1;
} elseif($page_out['now_page'] > $page_count){
  $page_out['now_page'] = $page_count;
}

$page_out['offset'] = ($page_out['now_page'] - 1) * $per;
//URL正则
$SELF = "[url=http://{$_SERVER[]http://{$_SERVER['HTTP_HOST']}{$_SERVER['PHP_SELF'[/url]]}?";
@$QUERY = $_SERVER['QUERY_STRING'];
$query_page = preg_replace(array("!((&|^)page=([^&]+))|(page=)!" , "!(^&)|[&]{2,}|([&]$)!") , array('' , '') , $QUERY);
$query_page = $SELF . $query_page . ($query_page ? "&" : "");
/*first page*/
$page_out['page_first'] = '1';
if($page_out['page_first'] == $page_out['now_page']){
  $page_out['page_first'] = '<li class="previous-off"><<首页</li>';
}else{
  $page_out['page_first'] = '<li><a href="?page=1"><<首页</a></li>';
}
/*last page*/
$page_out['page_last'] = $page_count;
if($page_out['page_last'] == $page_out['now_page']){
  $page_out['page_last'] = '<li class="next-off"">尾页>></li>';
}else{
  $page_out['page_last'] = '<li><a href="?page=' . $page_count. '">尾页>></a></li>';
}
//限制分页 2008-6-2 Edit
$pageleft = $page_out['now_page'] >= 4 ? $page_out['now_page'] - 4 : 1;
$pageright = $page_out['now_page'] + 4 <= $page_count ? $page_out['now_page'] + 4 : $page_count;

for($i = $pageleft; $i <= $pageright; $i++) {
  if($i == $page_out['now_page']){
   $page_out['page_str'] .= '<li class="active">' . $i . '</li>';
  } else {
   $page_out['page_str'] .= '<li><a href="' . $query_page . 'page=' . $i . '">' . $i . '</a></li>';
  }
}
return $page_out;
}
?>

复制PHP内容到剪贴板
PHP代码:
CSS  文件

/*PAGE*/
#page li { border:0; margin:0; padding:0; font-size:11px; list-style:none; /* savers */ float:left; }
#page a { border:solid 1px #9aafe5; margin-right:2px; }
#page .previous-off,#page .next-off { border:solid 1px #DEDEDE; color:#888888; display:block; float:left; font-weight:bold; margin-right:2px; padding:3px 4px; }
#page .next a,#page .previous a { font-weight:bold; }
#page .active     { background:#2e6ab1; color:#FFFFFF; font-weight:bold; display:block; float:left; padding:4px 6px; /* savers */ margin-right:2px; }
#page a:link,#page a:visited  { color:#0e509e; display:block; float:left; padding:3px 6px; text-decoration:none; }
#page a:hover{ border:solid 1px #0e509e; }

php file_get_contents读取远程文件并输出,这样做的好得就是不会在flash播放代码中显示对方网站的文件地址,下面是我自己用的一个.是读取方视频文件用的.

<?php
require_once("s/s.php");
 $a_id =get_value('id','');
 if(is_numeric($a_id) ){
                                            
   $result =mysql_query("Select * from s where id='$a_id'") or die(mysql_error());
   
   if( mysql_num_rows($result) ){
   
     $rs  =mysql_fetch_array( $result );     
     
     $swfpath=$rs[5];
     
   }
 }
 
 function Get_swf($url){
    
  $data = file_get_contents($url);
  
  header("content-type: application/x-shockwave-flash");
  
  echo $data;

 }
?>
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