// Check
if( !Validate::isPhoneNumber( $_POST['phone'] ) )
{
$this->errors[] = Tools::displayError('Invalid phone number');
}
if( !Validate::isEmail( $_POST['email'] ) )
{
$this->errors[] = Tools::displayError('Invalid email');
}
if(!empty($this->errors))
{
return false;
}
**Template side :** make sure your have {include file="$tpl_dir./errors.tpl"}
Involved classes : .alert, .alert-success, .alert-danger, .alert-error