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Unable to insert second entry on database [closed]
<html>
    <body>
    <h1 style="color:#03F; font-size: 25px;">Add User</h1>
<hr />
<form method="post" action="manipulate_item.php?id=adduser">
    <table>
    <tr>
    <td><b>Add As:</b></td>
    <td><select name="regas" style="width:200px;">
    <option>Student</option>
    <option>Teacher</option>
    </select></td></tr>
    <tr>
    <td><b>ID Number:</b></td>
    <td><input type="text" name="id" style="width:200px;"></td></tr>
    </table>

<input type="submit" name="button" id="button" value="Add User" />
<input type="reset" name="button3" id="button3" value="Cancel" />

if(!count($err))
        {
        $row=mysql_fetch_array(mysql_query("SELECT * FROM tz_members WHERE id='$id' AND regas='$regas'"));
            if($row)
            {
            $err[]='User ID already exists!';
                $_SESSION['msg']['reg-err'] = implode('<br />',$err);
            }
            else
            {
                $q=mysql_query("INSERT INTO tz_members(regas, id) VALUES('$regas', '$id')");
                if(mysql_affected_rows($connect)==1)
                        {
                            $_SESSION['msg']['reg-success']='New User Added!';
                            header("Location:allusers.php");
                            exit;
                        }
                else
                        {
                            $err[]='Cannot insert item.';
                            $_SESSION['msg']['reg-err'] = implode('<br />',$err);
                        }
            }

        }

CREATE TABLE tz_members (
regas varchar(8) collate utf8_unicode_ci NOT NULL,
id int(11) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

$row=mysql_fetch_array(mysql_query("SELECT COUNT(*) as  count FROM tz_members WHERE id='$id' AND regas='$regas'"));
if($row['count'] > 0) {
   // Rest of your code