/** * Defined by Zend_Validate_Interface * * Returns true if and only if $value contains only alphabetic and digit characters * * @param string $value * @return boolean */ public function isValid($value) { $valueString = (string) $value; $this->_setValue($valueString); if ('' === $valueString) { $this->_error(self::STRING_EMPTY); return false; } if (null === self::$_filter) { /** * @see Zend_Filter_Alnum */ //require-once 'Dkplus/Filter/AlnumUnderline.php'; self::$_filter = new Dkplus_Filter_AlnumUnderline(); } self::$_filter->setMeansEnglishAlphabet($this->_meansEnglishAlphabet); self::$_filter->allowWhiteSpace = $this->allowWhiteSpace; if ($valueString !== self::$_filter->filter($valueString)) { $this->_error(self::NOT_ALNUM); return false; } return true; }