<?php
$host="localhost"; // Host name
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="slate"; // Database name
$tbl_name="posts"; // Table name
echo "TEST Username or Password";
// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

$class=$_POST['class'];


$sql="SELECT post FROM $tbl_name WHERE class='$class'";
$result=mysql_query($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

while($row = mysql_fetch_array($result))
  {
	  echo "<div>";
  echo $row['post'];
  echo "<br />";
  echo "</div>";
  }

mysql_close($con);
?>