php, login script -

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i new in php , trying write registration script. problem when try sign in , can't see user`s menu. maybe problem sessions , cookies can't find it. here part of code:

config.php

<?php   ob_start();    $con = mysql_connect("localhost","root","123");   if (!$con) {     die('could not connect: ' . mysql_error());   }   mysql_select_db("9gag", $con);   $logged = mysql_query("select * users id='$_cookie[id]' , password = '$_cookie[password]'");    $logged = mysql_fetch_array($logged);  ?>

login.php

<?php    ob_start();    include("config.php");    if (!$logged[username]) {      if (!$_post[login]) {        echo("<center><form method=\"post\">              <table>              <tr>              <td align=\"right\">              user: <input type=\"text\" size=\"15\" maxlength=\"25\" name=\"username\">              </td>              </tr>              <tr>              <td align=\"right\">              password: <input type=\"password\" size=\"15\" maxlength=\"25\" name=\"password\">              </td></tr><tr>              <td align=\"center\">              <input type=\"submit\" name=\"login\" value=\"sign in\">              </td></tr><tr>              <td align=\"center\">              <a href=\"register.php\">sign up</a>              </td></tr></table></form></center>");      }      if ($_post[login]) {          $username = $_post[username];          $password = $_post[password];          $info = mysql_query("select * users username = '$username'") or die(mysql_error());           $data = mysql_fetch_array($info);          if($data['password'] != $password) {              echo "wrong username or password!";          }else{              $query = mysql_query("select * users username = '$username'") or die(mysql_error());              $user = mysql_fetch_array($query);              setcookie("id", $user['id'],time()+(60*60*24*5), "/", "");              setcookie("password", $user['password'],time()+(60*60*24*5), "/", "");          }      }  }  else {      echo ("<center>welcome <b>$logged[username]</b><br /></center>                  <a href=\"editprofile.php\">profile</a><br />                  <a href=\"logout.php\">log out</a>");  }  ?>

how said change coockie session, haven't understood table/columns layout i've tried make better code try :)

config.php

 <?php    $con = mysql_connect("localhost","root","123");   if (!$con) {     die('could not connect: ' . mysql_error());   }   mysql_select_db("9gag", $con); ?>

login.php

    <?php    session_start();   ob_start();   include("config.php");    if (!isset($_session['id'])) {      if (!$_post['login']) {        echo '<center><form method="post">              <table>              <tr>              <td align="right">              user: <input type="text" size="15" maxlength="25" name="username">              </td>              </tr>              <tr>              <td align="right">              password: <input type="password" size="15" maxlength="25" name="password">              </td></tr><tr>              <td align="center">              <input type="submit" name="login" value="sign in">              </td></tr><tr>              <td align="center">              <a href="register.php">sign up</a>              </td></tr></table></form></center>';      }      if ($_post[login]) {          $username = $_post['username'];          $password = $_post['password'];          $info = mysql_query("select * users username = '".$username."'") or die(mysql_error());           $data = mysql_fetch_array($info);          if($data['password'] != $password) {              echo "wrong username or password!";          }else{              $query = mysql_query("select * users username = '".$username."'") or die(mysql_error());              $user = mysql_fetch_array($query);              $_session['username']=$user['username'];             $_session['id']=$user['id'];             $_session['password']=$user['password'];         }      }  }  else {      echo "<center>welcome <b>".$_session['username']."</b><br /></center>                  <a href='editprofile.php'>profile</a><br />                  <a href='logout.php'>log out</a>";  }  ?>

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