Validate function

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		if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate() && $this->validateFAX()) {
			$this->model_account_customer->editCustomer($this->request->post);

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private function validateFAX(){

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private function validateFAX () {
    {
        $ncn = preg_replace( '/[^0-9A-Z]/i', '', $this->request->post['fax'] );
        if (preg_match('/X?[0-9]{8}[A-Z]/i', $ncn))
        {
              $ncn = preg_replace('/^X/i', '', $ncn);
              $stack = 'TRWAGMYFPDXBNJZSQVHLCKE';
              $pos = substr($ncn, 0, 8) % 23;
              if (strtoupper( substr($ncn, 8, 1) ) == substr($stack, $pos, 1) )
                  return TRUE;
        }
        else if (preg_match('/[A-HK-NPQS][0-9]{7}[A-J0-9]/i', $ncn))
        {
              $sum = 0;
              for ($i=2; $i<strlen($ncn)-1; $i+=2) {
                  $sum += substr($ncn, $i, 1);
              }

              for ($i=1; $i<strlen($ncn)-1; $i+=2) {
                  $t = substr($ncn, $i, 1) * 2;
                  $sum += ($t>9)?($t-9):$t;
              }
              $control = 10 - ($sum % 10);
              if ( substr($ncn, 8, 1) == $control ||
                   strtoupper(substr($ncn, 8, 1)) == substr('JABCDEFGHI', $control, 1 ))
                  return TRUE;
              }
              $this->error['fax'] = $this->language->get('error_fax');
              return FALSE;
        }
    }

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if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate() && $this->validateFAX()) {
			unset($this->session->data['guest']);
			
			$this->model_account_customer->addCustomer($this->request->post);

			$this->customer->login($this->request->post['email'], $this->request->post['password']);
	  	  
	  		$this->redirect($this->url->link('account/success'));
    	}