Many people may use a PHP mySQL function for login sections for a website

I am trying to use this code;

**ON EACH CONTENT PAGE - TO CHECK IF LOGGED IN** (in the header of every content page)

```
<?php
session_start();
if(! isset($_SESSION["myusername"]) ){
header("location:main_login.php");
}
?>
<html>
<body>
Page Content Here
</body>
</html>

```

**THE LOGIN SCRIPT** (which is referred to by my main\_login.php page)

```
<?php

ob_start();
$host="ClubEvents.db.9606426.hostedresource.com"; // Host name 
$username="ClubEventsRead"; // Mysql username 
$password="Pa55word!"; // Mysql password 
$db_name="ClubEvents"; // Database name 
$tbl_name="members"; // Table 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");

// Define $myusername and $mypassword 
$myusername=$_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 $tbl_name WHERE username='$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"
session_register("myusername");
session_register("mypassword"); 
header("location:login_success.php");
}
else {
echo "Wrong Username or Password";
}
ob_end_flush();
?>

```

**THE LOGOUT CODE**

```
<?
session_start();
session_destroy();

header("location:main_login.php");
exit();
?> 

```

**MAIN\_LOGIN.php**

```
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="form1" method="post" action="checklogin.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="myusername" type="text" id="myusername"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="mypassword" type="text" id="mypassword"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="Submit" value="Login"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
<?php
phpinfo()
?>

```

but something isnt working, the page login\_success.php should only be accessable when logged in, so either the logout isnt working, or, the login\_success.php check isnt working. But I don't know how to tell, I have tried playing around with them both, and still no further forward

Regards

Henry