php 登陆并设置cookie代码

提供一款可以保存用户登陆的信息来做了，这里就是一个简单的php 登陆并设置cookie代码哦，很简单的。

if(!$c_log){
$title.='登陆';
if($_SERVER['REQUEST_METHOD']=='POST'){
  if(isset($_POST['username']) && trim($_POST['username'])!='' && isset($_POST['password']) && trim($_POST['password'])!=''){
   $username=trim($_POST['username']);
   $password=enc_p(trim($_POST['password']));
   $q_author=sprintf('select * from %s where username=%s and password=%s', $dbprefix.'member', SQLString($username, 'text'), SQLString($password, 'text'));
   $author=mysql_query($q_author) or die('');
   $r_author=mysql_fetch_assoc($author);
   if(mysql_num_rows($author)>0){
    if($r_author['status']==0 || $r_main['veri']>0){
     $uSQL=sprintf('update %s set visit=visit+1, visitdate=%s where id=%s', $dbprefix.'member', time(), $r_author['id']);
     $result=mysql_query($uSQL) or die('');
     session_unset();
     session_start();
     $_SESSION['palu_id']=$r_author['id'];
     if(isset($_POST['remember']) && $_POST['remember']=='1'){
      setcookie('palu_u', $username, time()+86400*30);
      setcookie('palu_p', $password, time()+86400*30);
     }else{
      setcookie('palu_u','',time());
      setcookie('palu_p','',time());
     }
    }else{
     $e=1;
    }
   }else{
    $e=2;
   }
   mysql_free_result($author);
  }
  if(isset($_GET['m']))$u[]='m='.$_GET['m'];
  if(isset($_GET['t']))$u[]='t='.$_GET['t'];
  if(isset($_GET['page']))$u[]='page='.$_GET['page'];
  if(isset($e))$u[]='e='.$e;
  $topinfo.='<script type="text/JavaScript">location.href=''.(isset($u)?'?'.join('&', $u):'./').'';</script>';
}else{
  if(isset($_GET['e'])){
   if($_GET['e']==2){
    $msg='用户名/密码错误！';
   }elseif($_GET['e']==3){
    $msg='注册成功！请'.($r_main['veri']>0?'登陆':'等待管理员审核').'。';
   }else{
    $msg='您的帐号还没有通过审核，请稍候再试。';
   }
  }
  $content.='<div class="tcontent">'.(isset($msg)?'<div class="msg_v">'.$msg.'</div>':'').'<div class="title">登陆</div><div class="lcontent"><form method="post" action="" onsubmit="return chklog();"><div class="formline"><label for="formname">用户名：</label><input name="username" id="formname" size="32" maxlength="20" /></div><div class="formline"><label for="formpw">密　码：</label><input name="password" id="formpw" size="32" maxlength="20" type="password" /></div><div class="formline"><label></label><input name="remember" value="1" type="checkbox" title="为了确保信息安全，请不要在网吧或者公共机房选择此项！如果今后要取消此选项，只需点击“退出登陆”即可。" />记住我</div><div class="formline"><input type="submit" value="登陆" id="formsubmit" class="button" /> <input type="reset" value="取消" class="button" /><br/>'.($r_main['openreg']==0?'<a href="?m=reg">加入本班</a> | ':'').'<a href="?m=lostpw">忘记密码</a></div></form></div></div>';
}
}else{
$topinfo.='<script type="text/JavaScript">location.href='./';</script>';
}
?>

补充：Php教程,Php入门