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function strHideWord($str,$extent=null,$color="",$pos=0) {
    $str_len = strlen($str);
    $str_key = array();
    $seq = 0;
    for($i=0;$i<$str_len;$i++) {
        if(ord($str[$i]) > 128) {
            $seq++;
            if($seq%2==0)
                $str_key[]=$i+1;
        } else {
            $str_key[]=$i+1;
        }
    }
    $array_cnt = count($str_key);

    if($extent === null)
        $extent = intval($array_cnt/2);
    elseif($extent && $extent > $array_cnt)
        return $str;

    if($extent && $pos==0)
        $rtn = substr($str,0,$str_key[$extent-1]);
    elseif($extent && $pos==1)
        $rtn = substr($str,$str_key[$array_cnt - $extent-1],$str_len);

    for($i=$extent;$i<$array_cnt;$i++) {
        $ertn .= "X";
    }

    if($color)
        $ertn = "<font color='".$color."'>".$ertn."</font>";

    if($pos)
        return $ertn.$rtn;
    else
        return $rtn.$ertn;
}

strHideWord(¹®ÀÚ¿­,º¸¿©ÁÙ±æÀÌ,¸¶Å·»ö»ó,¸¶Å·À§Ä¡);

º¸¿©ÁÙ±æÀÌ null -> ¹®ÀÚ¿­ Àý¹Ý¸¸ ¸¶Å·
º¸¿©ÁÙ±æÀÌ 0 -> Àüü ¹®ÀÚ¿­ ¸¶Å·

¸¶Å·À§Ä¡ -> 0 ¿ÞÂÊ ±ÛÀÚº¸¿©ÁÜ
¸¶Å·À§Ä¡ -> 1 ¿À¸¥ÂÊ ±ÛÀÚ¸¸ º¸¿©ÁÜ

echo strHideWord('°¡1³ª´Ù¶ó¸¶¸¶1212¤¤¾È¾Æ',3,'red',0);
-> °¡1³ªXXXXXXXXXXX

echo strHideWord('°¡1³ª´Ù¶ó¸¶¸¶1212¤¤¾È¾Æ',3,'red',1);
-> XXXXXXXXXXX¤¤¾È¾Æ

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