Alpha.php

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<?php
#require_once 'Zend/Validate/Abstract.php';

class Zend_Validate_Alpha extends Zend_Validate_Abstract
{
    const INVALID      = 'alphaInvalid';
    const NOT_ALPHA    = 'notAlpha';
    const STRING_EMPTY = 'alphaStringEmpty';

    public $allowWhiteSpace;

    protected static $_filter = null;

    protected $_messageTemplates = array(
        self::INVALID      => "Invalid type given. String expected",
        self::NOT_ALPHA    => "'%value%' contains non alphabetic characters",
        self::STRING_EMPTY => "'%value%' is an empty string"
    );

    public function __construct($allowWhiteSpace = false)
    {
        if ($allowWhiteSpace instanceof Zend_Config) {
            $allowWhiteSpace = $allowWhiteSpace->toArray();
        }

        if (is_array($allowWhiteSpace)) {
            if (array_key_exists('allowWhiteSpace', $allowWhiteSpace)) {
                $allowWhiteSpace = $allowWhiteSpace['allowWhiteSpace'];
            } else {
                $allowWhiteSpace = false;
            }
        }

        $this->allowWhiteSpace = (boolean) $allowWhiteSpace;
    }

    public function getAllowWhiteSpace()
    {
        return $this->allowWhiteSpace;
    }

    public function setAllowWhiteSpace($allowWhiteSpace)
    {
        $this->allowWhiteSpace = (boolean) $allowWhiteSpace;
        return $this;
    }

    public function isValid($value)
    {
        if (!is_string($value)) {
            $this->_error(self::INVALID);
            return false;
        }

        $this->_setValue($value);

        if ('' === $value) {
            $this->_error(self::STRING_EMPTY);
            return false;
        }

        if (null === self::$_filter) {
            #require_once 'Zend/Filter/Alpha.php';
            self::$_filter = new Zend_Filter_Alpha();
        }

        self::$_filter->allowWhiteSpace = $this->allowWhiteSpace;

        if ($value !== self::$_filter->filter($value)) {
            $this->_error(self::NOT_ALPHA);
            return false;
        }

        return true;
    }

}