Zend form validation multiple custom validation message for same field at the same time - forms

Question

I have a Zend form password custom validation.
I have set the addValidator functions IInd argument to false since I need to get all errors at once. Both of my validation classes have set the self::INVLID to corresponding error messages.
But when I look in the Zend controller even though both validations fail I'm getting only one (the last) error message.
I need all the error messages at once.
/* Form validation*/
$passwordSpecialValidator = new Passwordspecialvalidationvalidator();
$passwordHistoryValidator = new Passwordhistorylvalidationvalidator(new model(), $username, $newpass);
$this->newpass->addValidator($passwordSpecialValidator, false)
->addValidator($passwordHistoryValidator, false);
/* One validation class */
class Passwordhistorylvalidationvalidator extends Zend_Validate_Abstract {
const INVLID = '';
protected $_messageTemplates = array(
self::INVLID => 'Your password doesnt meet the history requirements'
);
public function __construct($model, $username, $password) {
$this->_model = $model;
$this->_username = $username;
$this->_password = $password;
}
public function isValid($value, $context = null) {
if ($this->_username == "") {
$auth = Zend_Auth::getInstance();
if ($auth->hasIdentity()) {
$arrayResult = $auth->getIdentity();
if (isset($arrayResult->username)) {
$this->_username = $arrayResult->username;
}
}
}
$passwordExists = false;
$oldPasswords = $this->_model->getHistoryPasswords($this->_username, $this->_password);
if (count($oldPasswords) > 0) {
$passwordExists = true;
}
if ($passwordExists == false) {
return true;
} else {
$this->_setValue($value);
$this->_error(self::INVLID);
return false;
}
}
}
/* Getting error messages */
foreach ($objForm->getMessages() as $messages) {
foreach ($messages as $message) {
$errMessages[] = $message;
}
}
But the array $errMessages has only the last validation message (without index) even though both special validation and history validation fails. How would I get both error messages in an array if both validations fail?