Register

<?php


$db_host = "localhost";
$db_username = "nakedsrc_pro";
$db_password = "l546745156";
$db_name = "nakedsrc_pro";


session_start();
mysql_connect($db_host, $db_username, $db_password) or die( mysql_error() );
mysql_select_db($db_name) or die(mysql_error());
mysql_query("SET NAMES UTF8");

if ( $_POST['button'] == "register" )
{

    $username = mysql_real_escape_string ( strip_tags ( $_POST['txtUsername' ] ) );
    $password = mysql_real_escape_string ( strip_tags ( $_POST['txtPassword' ] ) );
    $email = mysql_real_escape_string ( strip_tags ( $_POST['txtEmail' ] ) );


    if ( trim( $_POST['txtUsername'] == "" ) )
    {
        echo "Please add input username";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit;
    }
    else if ( trim( $_POST['txtPassword'] == "" ) )
    {
        echo "Please add input Password";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit;
    }
    else if ( trim( $_POST['txtEmail'] == "" ) )
    {
        echo "Please add input Email";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit;
    }
    else if ( trim ( $_POST['txtPassword'] != $_POST['txtConPassword'] ) )
    {
        echo "Password is not match";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit;
    }
    else if (!preg_match('/^[\w][\w_]*$/', $username)) // username: allow only  a-zA-Z0-9_ but not begining with _
    {

        echo "username use a-z A-Z and 0-9 ";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit();

    }
    else if(!preg_match('/^[\w][\w_]*$/', $password))
    {


        echo "Password use a-z A-Z and 0-9 ";
        echo '<meta  http-equiv="refresh" content="3;url=.">';
        exit();
    }
    else
    {


        $result = "INSERT INTO member ( Username, Password, Email, Hardware ) VALUES ( '$username', '$password', '$email', '0' )";
        mysql_query ( $result );

        echo "register complete";
        echo '<meta  http-equiv="refresh" content="3;url=././">';
        exit();

    }

}


?><head>

<script src='https://www.google.com/recaptcha/api.js'></script>

</head>


<form method="post">
  <table width="500" border="0" align="center">
    <tr>
        <td width="196" height="31"><div align="right">Username:</div></td>
        <td width="144"><input type="text" name="txtUsername" /></td>
      </tr>
      <tr>
        <td><div align="right">Password::</div></td>
        <td><input type="password" name="txtPassword" /></td>
      </tr>
      <tr>
        <td><div align="right">Confirm Password:</div></td>
        <td>
        <input type="password" name="txtConPassword" />
        </td>
      </tr>
      <tr>
        <td><div align="right">Email:</div></td>
        <td><input type="email" name="txtEmail" /></td>
      </tr>
      <tr>
        <td><div align="right">Captcha:</div></td>
        <td></td>
      </tr>
      <tr>
        <td>&nbsp;</td>
        <td><input name="button" type="submit" value="register"></td>
      </tr>
    </table>
    <p></p>
</form>