javascript - Redirect a logged in user from login page to user dashboard with php -

i need manage php page redirection function.

i want logged in users redirect user dashboard instead of displaying login page typing address in browser's address bar. how prevent users display login page

login page codes given below

<?php   include 'dbc.php';  $err = array();  foreach($_get $key => $value) {     $get[$key] = filter($value); //get variables filtered. }  if ($_post['dologin']=='login') {  foreach($_post $key => $value) {     $data[$key] = filter($value); // post variables filtered }   $user_email = $data['user_email']; $pass = $data['pwd'];   if (strpos($user_email,'@') === false) {     $user_cond = "user_name='$user_email'"; } else {       $user_cond = "user_email='$user_email'";  }   $result = mysql_query("select `id`,`pwd`,`full_name`,`approved`,`user_level` users             $user_cond             , `banned` = '0'             ") or die (mysql_error());  $num = mysql_num_rows($result);    // match row found more 1 results  - user authenticated.      if ( $num > 0 ) {       list($id,$pwd,$full_name,$approved,$user_level) = mysql_fetch_row($result);      if(!$approved) {     //$msg = urlencode("account not activated. please check email activation code");     $err[] = "account not activated. please check email activation code";      //header("location: login.php?msg=$msg");      //exit();      }          //check against salt     if ($pwd === pwdhash($pass,substr($pwd,0,9))) {      if(empty($err)){                   // sets session , logs user in          session_start();        session_regenerate_id (true); //prevent against session fixation attacks.         // sets variables in session          $_session['user_id']= $id;           $_session['user_name'] = $full_name;         $_session['user_level'] = $user_level;         $_session['http_user_agent'] = md5($_server['http_user_agent']);          //update timestamp , key cookie         $stamp = time();         $ckey = genkey();         mysql_query("update users set `ctime`='$stamp', `ckey` = '$ckey' id='$id'") or die(mysql_error());          //set cookie          if(isset($_post['remember'])){                   setcookie("user_id", $_session['user_id'], time()+60*60*24*cookie_time_out, "/");                   setcookie("user_key", sha1($ckey), time()+60*60*24*cookie_time_out, "/");                   setcookie("user_name",$_session['user_name'], time()+60*60*24*cookie_time_out, "/");                    }           header("location: dashboard.php");          }         }         else         {         //$msg = urlencode("invalid login. please try again correct user email , password. ");         $err[] = "invalid login. please try again correct user email , password.";         //header("location: login.php?msg=$msg");         }     } else {         $err[] = "error - invalid login. no such user exists";       }      }    ?> 

i put codes got no effect. please elaborate , give example how exactly.

<?php   include 'dbc.php';  if (isset ($_session['status_logged']) && $_session['status_logged'] = true) {         header('location: dashboards.php');     }     else {         $_session['status_logged'] = false;     }  $err = array();  foreach($_get $key => $value) {     $get[$key] = filter($value); //get variables filtered. }  if ($_post['dologin']=='login') {  foreach($_post $key => $value) {     $data[$key] = filter($value); // post variables filtered }   $user_email = $data['user_email']; $pass = $data['pwd'];   if (strpos($user_email,'@') === false) {     $user_cond = "user_name='$user_email'"; } else {       $user_cond = "user_email='$user_email'";  }   $result = mysql_query("select `id`,`pwd`,`full_name`,`approved`,`user_level` users             $user_cond             , `banned` = '0'             ") or die (mysql_error());  $num = mysql_num_rows($result);    // match row found more 1 results  - user authenticated.      if ( $num > 0 ) {       list($id,$pwd,$full_name,$approved,$user_level) = mysql_fetch_row($result);      if(!$approved) {     //$msg = urlencode("account not activated. please check email activation code");     $err[] = "account not activated. please check email activation code";      //header("location: login.php?msg=$msg");      //exit();      }          //check against salt     if ($pwd === pwdhash($pass,substr($pwd,0,9))) {      if(empty($err)){                   // sets session , logs user in          session_start();        session_regenerate_id (true); //prevent against session fixation attacks.          // sets variables in session      $_session['user_id']= $id;       $_session['user_name'] = $full_name;     $_session['user_level'] = $user_level;     $_session['http_user_agent'] = md5($_server['http_user_agent']);     $_session['status_logged'] = true; //new line          //update timestamp , key cookie         $stamp = time();         $ckey = genkey();         mysql_query("update users set `ctime`='$stamp', `ckey` = '$ckey' id='$id'") or die(mysql_error());          //set cookie          if(isset($_post['remember'])){                   setcookie("user_id", $_session['user_id'], time()+60*60*24*cookie_time_out, "/");                   setcookie("user_key", sha1($ckey), time()+60*60*24*cookie_time_out, "/");                   setcookie("user_name",$_session['user_name'], time()+60*60*24*cookie_time_out, "/");                    }           header("location: dashboard.php");          }         }         else         {         //$msg = urlencode("invalid login. please try again correct user email , password. ");         $err[] = "invalid login. please try again correct user email , password.";         //header("location: login.php?msg=$msg");         }     } else {         $err[] = "error - invalid login. no such user exists";       }      }    ?>