Alpha.php

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<?php
#require_once 'Zend/Filter/Interface.php';

#require_once 'Zend/Locale.php';

class Zend_Filter_Alpha implements Zend_Filter_Interface
{
    public $allowWhiteSpace;

    protected static $_unicodeEnabled;

    protected $_locale;

    protected static $_meansEnglishAlphabet;

    public function __construct($allowWhiteSpace = false)
    {
        if ($allowWhiteSpace instanceof Zend_Config) {
            $allowWhiteSpace = $allowWhiteSpace->toArray();
        } else if (is_array($allowWhiteSpace)) {
            if (array_key_exists('allowwhitespace', $allowWhiteSpace)) {
                $allowWhiteSpace = $allowWhiteSpace['allowwhitespace'];
            } else {
                $allowWhiteSpace = false;
            }
        }

        $this->allowWhiteSpace = (boolean) $allowWhiteSpace;
        if (null === self::$_unicodeEnabled) {
            self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
        }

        if (null === self::$_meansEnglishAlphabet) {
            $this->_locale = new Zend_Locale('auto');
            self::$_meansEnglishAlphabet = in_array($this->_locale->getLanguage(),
                                                    array('ja', 'ko', 'zh')
                                                    );
        }

    }

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

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

    public function filter($value)
    {
        $whiteSpace = $this->allowWhiteSpace ? '\s' : '';
        if (!self::$_unicodeEnabled) {
            // POSIX named classes are not supported, use alternative a-zA-Z match
            $pattern = '/[^a-zA-Z' . $whiteSpace . ']/';
        } else if (self::$_meansEnglishAlphabet) {
            //The Alphabet means english alphabet.
            $pattern = '/[^a-zA-Z'  . $whiteSpace . ']/u';
        } else {
            //The Alphabet means each language's alphabet.
            $pattern = '/[^\p{L}' . $whiteSpace . ']/u';
        }

        return preg_replace($pattern, '', (string) $value);
    }
}