/**
* Defined by Zend_Validate_Interface
*
* Returns true if and only if $value only contains digit characters
*
* @param string $value
* @return boolean
*/
public function isValid($value)
{
if (!is_string($value) && !is_int($value) && !is_float($value)) {
$this->_error(self::INVALID);
return false;
}
$this->_setValue((string) $value);
if ('' === $this->_value) {
$this->_error(self::STRING_EMPTY);
return false;
}
if (null === self::$_filter) {
require_once 'Zend/Filter/Digits.php';
self::$_filter = new Zend_Filter_Digits();
}
if ($this->_value !== self::$_filter->filter($this->_value)) {
$this->_error(self::NOT_DIGITS);
return false;
}
return true;
}
public function isValid($value)
{
$valueString = (string) $value;
$this->_setValue($valueString);
if ('' === $valueString) {
$this->_error(self::STRING_EMPTY);
return false;
}
if (null === self::$_filter) {
require_once 'Zend/Filter/Digits.php';
self::$_filter = new Zend_Filter_Digits();
}
if ($valueString !== self::$_filter->filter($valueString)) {
$this->_error(self::NOT_DIGITS);
return false;
}
return true;
}
