title: $error=array() doesn't store errors and not displaying it.
body: <p>Hey can annyone view my code and explain? $error = array() doesnt store my errors and 
  $error[] = 'Wrong username or password!'; dont working. I need display my error at same page as i have login script.</p>
  
  <pre><code>  &lt;?php
  
  
  $host="localhost"; // Host name
  $username="root"; // Mysql username
  $password=""; // Mysql password
  $db_name="2"; // Database name
  
  // Connect to server and select databse.
  mysql_connect("$host", "$username", "$password")or die("cannot connect");
  mysql_select_db("$db_name")or die("cannot select DB");
  if (isset($_POST['formsubmitted'])) {
      $error = array();//Declare An Array to store any error message 
  };  
  // username and password sent from form
  $myusername=$_POST['myusername'];
  $mypassword=$_POST['mypassword'];
  
  // To protect MySQL injection (more detail about MySQL injection)
  $myusername = stripslashes($myusername);
  $mypassword = stripslashes($mypassword);
  $myusername = mysql_real_escape_string($myusername);
  $mypassword = mysql_real_escape_string($mypassword);
  
  $sql="SELECT * FROM `members` WHERE username='$myusername' and password='$mypassword'";
  $result=mysql_query($sql);
  
  // Mysql_num_row is counting table row
  $count=mysql_num_rows($result);
  
  // If result matched $myusername and $mypassword, table row must be 1 row
  
  if($count==1){
  
  // Register $myusername, $mypassword and redirect to file "login_success.php"
  //store data:
  $_SESSION['$myusername'];
  $_SESSION['$mypassword']; 
  //next page:
  
  header("location:login_success.php");
  }
  else {
   $error[] = 'Wrong username or password!';
  };
  ?&gt;
  
  ty!
  </code></pre>