check email sudah didatabase

class Member_model extends CI_Model {
	//==== Constructor ====//
	function Member_model()
	{
		parent::__construct();
	}
 
	//==== Inisialisasi nama tabel yang digunakan ====//
	var $table = 'tbl_member';
 
	//==== Menambahkan sebuah data ke tabel ====//
	function add($member)
	{
		$this->db->insert($this->table, $member);
	}
 
	//==== Mendapatkan email untuk di check ====//
	function get_member_by_email($email)
	{
		$condition = array("email"=>$this->db->escape_str($email));
		$query = $this->db->get_where($this->table, $condition);
 
		if ($query->num_rows() > 0)
		{
			return FALSE;
		}
		else
		{
			return TRUE;
		}
 
	}
}

class Member extends CI_Controller {
	// Constructor //
	function Member()
	{
		parent::__construct();
		$this->load->model('Member_model', '', TRUE);
		$this->load->library('form_validation');
	}
 
 
	// Berpindah ke form untuk entry data baru //
	function daftar()
	{		
		// Inisialisasi data umum
		$data['content_view'] 	= 'member/member_form';
		$data['form_action']	= site_url('member/add_process');
 
		$this->load->view('page', $data);
	}
 
	// Proses untuk entry data baru //
	function add_process()
	{		
		// Inisialisasi data umum
		$data['content_view'] 	= 'member/member_form';
		$data['form_action']	= site_url('member/add_process');
 
		// cek email 
		if ($this->form_validation->run() == TRUE)
		{
		   $email = $this->input->post('txt_email');
 
		   if ($this->Member_model->get_member_by_email($email) == TRUE)
		   {
 
			$filefoto 	= basename($_FILES['fl_foto']['name']);
				if($filefoto == '')
				{
					$filefoto = 'tidakadafoto.jpg';
				}
				else
				{   
					$filefoto 	= $filefoto;
					$path		= './foto/'.$filefoto;
					$upload		= copy($_FILES['fl_foto']['tmp_name'], $path);
				}
 
 
			// mengambil data untuk disimpan di tabel
			$member = array(
						'email' 	=> $this->input->post('txt_email'),
						'password' 	=> md5($this->input->post('txt_password')),
						'nama' 		=> $this->input->post('txt_nama'),
						'member_pict' 	=> $filefoto 
						);
 
			$this->Member_model->add($member);
 
			$this->session->set_flashdata('message', 'Terimakasih telah mendaftar menjadi member');
			redirect('member/daftar');	
 
				}
 
		   else
		   {
			$this->session->set_flashdata('message', 'Maaf, eMail Anda telah ada dalam database kami');
			redirect('member/daftar');
		   }
		}
	}
 
 
 
}

<form name="member_form" id="member_form"  method="post" enctype="multipart/form-data" action="<?php echo $form_action; ?>">
 
		<table width="550" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td width="150">eMail <em>*</em></td>
    <td width="5">:</td>
    <td width="395"><input type="text" name="txt_email" id="txt_email" value="<?php echo set_value('email', isset($default['email']) ? $default['email'] : ''); ?>" class="required email"/>
    </td>
  </tr>
  <tr>
    <td>Password <em>*</em></td>
    <td>:</td>
    <td><input type="password" name="txt_password" id="txt_password" value="<?php echo set_value('password', isset($default['password']) ? $default['password'] : ''); ?>" class="required" minlength="8"/></td>
  </tr>
  <tr>
    <td>Ulangi Password <em>*</em></td>
    <td>:</td>
    <td><input type="password" name="txt_repassword" id="txt_repassword" value="<?php echo set_value('repassword', isset($default['repassword']) ? $default['repassword'] : ''); ?>" class="required" minlength="8"/></td>
  </tr>
  <tr>
    <td>Nama <em>*</em></td>
    <td>:</td>
    <td><input type="text" name="txt_nama" id="txt_nama" value="<?php echo set_value('nama', isset($default['nama']) ? $default['nama'] : ''); ?>" class="required" minlength="3"/></td>
  </tr>
  <tr>
    <td>Foto</td>
    <td>:</td>
    <td><input type="file" name="fl_foto" id="fl_foto" size="30" style="height:25px;"></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td> <em>*</em> Wajib diisi</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
  <tr>
    <td colspan="3"><input type="submit" name="submit" id="submit" value="DAFTAR" class="content_button" /> <input type="reset" name="reset" id="reset" value="RESET" class="content_button" /></td>
  </tr>
  </table>
</form>