将ASCII字符转换为全角日文字母

I am trying to convert standard ASCII letters to their full-width Japanese equivalents. For example:

Game becomes Ｇａｍｅ

I searched for an answer and I found this question with a good answer that I've quoted below:

$str = "Ｇａｍｅ some other text by ヴィックサ";
$str = preg_replace_callback(
"/[\x{ff01}-\x{ff5e}]/u",
function($c) {
    // convert UTF-8 sequence to ordinal value
    $code = ((ord($c[0][0])&0xf)<<12)|((ord($c[0][1])&0x3f)<<6)|(ord($c[0][2])&0x3f);
    return chr($code-0xffe0);
},
$str);

But I wanted it in the opposite direction. I tried changing the (-) sign to (+) in the return statementm, but didnt have much success.

This is simple using PHP's mb_convert_kana function. See http://php.net/manual/en/function.mb-convert-kana.php. You want at a minimum the R mode to convert "han-kaku" alphabets to "zen-kaku".

"/[\x{ff01}-\x{ff5e}]/u" is for detecting if the letter is a full width. You have to find a half width letter first. So I changed to "/[\x{0021}-\x{007e}]/u". The unicode table is here http://jrgraphix.net/r/Unicode/0020-007F

The second is about encoding/decoding problem I think. You converted UTF-8 sequence to ordinal value(ASCII code). That chr() function returns charater from ASCII. and ASCII has no full width letter. So you have to convert from unicode.

I use ord() first to get ASCII code of the character and Added 65248. Then convert decimal to hex and placed behind of "\u" and covered with commas so I can use json_decode().

$str = "Ｇａｍｅ some other text by ヴィックサ";
$str = preg_replace_callback(
    "/[\x{0021}-\x{007e}]/u",
    function($c) {
        return json_decode('"'.('\\u'.dechex (ord($c[0])+65248)).'"');
    }, $str);

I couldn't use mb_convert_kana(). I don't know why but I think it's because I worked with Korean strings, not Japanese.

I'm not good at English but I hope this explanation helps you.

There's an easier way to do it:

$str = "Game";
// Becomes "Ｇａｍｅ"
$wideStr = mb_convert_kana($str, "R");