a Zend Filter for FullShape to HalfShape

Some Chinese PHP Programers maybe need such a Zend filter to help them finish the string converting of Fullshape(全角) to HalfShape(半角), so see the next code:
<br /><?php<br />/**<br /> * @see Zend_Filter_Interface<br /> */<br />require_once 'Zend/Filter/Interface.php';<br />class Zend_Filter_FullshapeToHalfshape implements Zend_Filter_Interface<br />{<br /> /**<br /> * Defined by Zend_Filter_Interface<br /> *<br /> * Returns the string $value, removing all but alphabetic and digit characters<br /> *<br /> * @param string $value<br /> * @return string<br /> */<br /> public function filter($value)<br /> {<br /> $patterns = array('/０/','/１/','/２/','/３/','/４/','/５/','/６/','/７/',<br /> '/８/','/９/','/ａ/','/ｂ/','/ｃ/','/ｄ/','/ｅ/','/ｆ/','/ｇ/','/ｈ/','/ｉ/',<br /> '/ｊ/','/ｋ/','/ｌ/','/ｍ/','/ｎ/','/ｏ/','/ｐ/','/ｑ/','/ｒ/','/ｓ/','/ｔ/',<br /> '/ｕ/','/ｖ/','/ｗ/','/ｘ/','/ｙ/','/ｚ/','/Ａ/','/Ｂ/','/Ｃ/','/Ｄ/','/Ｅ/',<br /> '/Ｆ/','/Ｇ/','/Ｈ/','/Ｉ/','/Ｊ/','/Ｋ/','/Ｌ/','/Ｍ/','/Ｎ/','/Ｏ/','/Ｐ/',<br /> '/Ｑ/','/Ｒ/','/Ｓ/','/Ｔ/','/Ｕ/','/Ｖ/','/Ｗ/','/Ｘ/','/Ｙ/','/Ｚ/','/·/',<br /> '/～/','/！/','/＠/','/＃/','/％/','/……/','/＆/','/×/','/（/','/）/','/－/',<br /> '/——/','/＝/','/＋/','/【/','/｛/','/】/','/｝/','/＼/','/｜/','/；/','/：/',<br /> '/‘/','/’/','/“/','/”/','/，/','/《/','/。/','/》/','/、/','/？/');<br /> $replacements = array('0','1','2','3','4','5','6','7','8','9','a','b','c',<br /> 'd','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u',<br /> 'v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M',<br /> 'N','O','P','Q','R','S','T','U','V','W','X','Y','Z','.','~','!','@','#',<br /> '%','......','&','*','(',')','-','_','=','+','[','{',']','}','\\','|',';',<br /> ':','\'','\'','\"','\"',',','<','.','>',',','?');<br /> return preg_replace($patterns, $replacements, (string) $value);<br /> }<br />}<br />?><br />