PHP×Ö·û´®·­×ªº¯Êý Ö§³ÖÖÐÎÄ×Ö·û(GBK±àÂë)

<?php
/*
 * Created on 2010-4-24
 * @author miaoyushun
 * ´Ë¿ÉÒÔʵÏÖ×Ö·û´®µÄµ¹Ðò
 * Ö§³Ö´¿Ó¢ÎÄÊý×Ö¡¢´¿ÖÐÎÄ×Ö·û´®ºÍÖÐÓ¢ÎÄÊý×Ö»ìºÏ×Ö·û´®
 * ÖÐÎÄÐèҪʹÓÃGBK±àÂë
 * Èô´«Èë²ÎÊý²»Îª×Ö·û´®Ôò·µ»Øfalse
 */
function strrev_ext ($str)
{
    if (is_string($str)) {
        $len = strlen($str);
        $newstr = "";
        for ($i = $len - 1; $i >= 0; $i -= 1) {
         if(ord($str{$i})>160){
          $newstr .= $str{$i-1}.$str{$i};
             $i-=1;
         }
         else{
          $newstr.=$str{$i};
         }
        }
        return $newstr;
    }
    else{
      return false;
    }
}
//º¯ÊýʹÓÃʾ·¶
//´¿Ó¢ÎÄ×Ö·û
$str="abcde";
echo strrev_ext($str)."<br />";
//´¿ºº×Ö
$str="¹âÔÂÃ÷Ç°´²";
echo strrev_ext($str)."<br />";
//ÖÐÓ¢»ìºÏ
$str="ÑôÌ«d54ÓÐaÉÏ2Ìì1";
echo strrev_ext($str)."<br />";
?>