How to convert Hiragana, Katakana or Kanji to Romaji using PHP

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I want to categorize Japanese words base on there first character. For example:

Group 1
All Japanese word that starts from

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あa いi うu えe おo
かka きki くku けke こko

Group 2
All Japanese word that starts from 

さsa しshi すsu せse そso
たta ちchi つtsu てte とto

What makes it difficult is some characters in Japanese are written to different type such as Hiragana, Katakana and Kanji which words are written differently but same in meaning.

It might be possible if I could only convert hiragana, katakana or kanji to romaji.

Can someone help me, Is it possible in PHP? or is their a plugin in WordPress that can do this?

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3 comments 

  1. function HiraganaToRomaji($hold) {

            $hold = str_replace("つ", "tsu", $hold);             
            $hold = str_replace("きゃ", "kya", $hold);
            $hold = str_replace("きゅ", "kyu", $hold);
            $hold = str_replace("きょ", "kyo", $hold);
            $hold = str_replace("しゃ", "sha", $hold);
            $hold = str_replace("しゅ", "shu", $hold);
            $hold = str_replace("しょ", "sho", $hold);
            $hold = str_replace("し", "shi", $hold);

            $hold = str_replace("ちゃ", "cha", $hold);
            $hold = str_replace("ちゅ", "chu", $hold);
            $hold = str_replace("ちょ", "cho", $hold);
            $hold = str_replace("ち", "chi", $hold);
            $hold = str_replace("ひゃ", "hya", $hold);
            $hold = str_replace("ひゅ", "hyu", $hold);
            $hold = str_replace("ひょ", "hyo", $hold);
            $hold = str_replace("りゃ", "rya", $hold);
            $hold = str_replace("りゅ", "ryu", $hold);
            $hold = str_replace("りょ", "ryo", $hold);
            $hold = str_replace("ぎゃ", "gya", $hold);
            $hold = str_replace("ぎゅ", "gyu", $hold);
            $hold = str_replace("ぎょ", "gyo", $hold);
            $hold = str_replace("びゃ", "bya", $hold);
            $hold = str_replace("びゅ", "byu", $hold);
            $hold = str_replace("びょ", "byo", $hold);
            $hold = str_replace("ぴゃ", "pya", $hold);

            $hold = str_replace("ぴゅ", "pyu", $hold);
            $hold = str_replace("ぴょ", "pyo", $hold);
            $hold = str_replace("じゃ", "ja", $hold);
            $hold = str_replace("じゅ", "ju", $hold);
            $hold = str_replace("じょ", "jo", $hold);
            $hold = str_replace("ば", "ba", $hold);
            $hold = str_replace("だ", "da", $hold);
            $hold = str_replace("が", "ga", $hold);
            $hold = str_replace("は", "ha", $hold);
            $hold = str_replace("か", "ka", $hold);
            $hold = str_replace("ま", "ma", $hold);
            $hold = str_replace("ぱ", "pa", $hold);

            $hold = str_replace("ら", "ra", $hold);
            $hold = str_replace("さ", "sa", $hold);
            $hold = str_replace("た", "ta", $hold);
            $hold = str_replace("わ", "wa", $hold);
            $hold = str_replace("や", "ya", $hold);
            $hold = str_replace("ざ", "za", $hold);
            $hold = str_replace("な", "na", $hold);
            $hold = str_replace("あ", "a", $hold);


            $hold = str_replace("べ", "be", $hold);
            $hold = str_replace("で", "de", $hold);
            $hold = str_replace("げ", "ge", $hold);
            $hold = str_replace("へ", "he", $hold);
            $hold = str_replace("け", "ke", $hold);
            $hold = str_replace("め", "me", $hold);
            $hold = str_replace("ぺ", "pe", $hold);
            $hold = str_replace("れ", "re", $hold);
            $hold = str_replace("せ", "se", $hold);
            $hold = str_replace("て", "te", $hold);
            $hold = str_replace("ぜ", "ze", $hold);
            $hold = str_replace("ね", "ne", $hold);


            $hold = str_replace("え", "e", $hold);
            $hold = str_replace("び", "bi", $hold);
            $hold = str_replace("ぎ", "gi", $hold);
            $hold = str_replace("ひ", "hi", $hold);
            $hold = str_replace("き", "ki", $hold);
            $hold = str_replace("み", "mi", $hold);
            $hold = str_replace("ぴ", "pi", $hold);
            $hold = str_replace("り", "ri", $hold);
            $hold = str_replace("じ", "ji", $hold);
            $hold = str_replace("に", "ni", $hold);


            $hold = str_replace("い", "i", $hold);
            $hold = str_replace("ぼ", "bo", $hold);
            $hold = str_replace("ど", "do", $hold);
            $hold = str_replace("ご", "go", $hold);
            $hold = str_replace("ほ", "ho", $hold);
            $hold = str_replace("こ", "ko", $hold);



            $hold = str_replace("も", "mo", $hold);
            $hold = str_replace("ぽ", "po", $hold);
            $hold = str_replace("ろ", "ro", $hold);
            $hold = str_replace("そ", "so", $hold);
            $hold = str_replace("と", "to", $hold);
            $hold = str_replace("を", "wo", $hold);
            $hold = str_replace("よ", "yo", $hold);
            $hold = str_replace("ぞ", "zo", $hold);

            $hold = str_replace("の", "no", $hold);
            $hold = str_replace("お", "o", $hold);
            $hold = str_replace("ぶ", "bu", $hold);
            $hold = str_replace("ぐ", "gu", $hold);
            $hold = str_replace("ふ", "fu", $hold);
            $hold = str_replace("く", "ku", $hold);
            $hold = str_replace("む", "mu", $hold);
            $hold = str_replace("ぷ", "pu", $hold);
            $hold = str_replace("る", "ru", $hold);
            $hold = str_replace("す", "su", $hold);


            $hold = str_replace("ゆ", "yu", $hold);
            $hold = str_replace("ず", "zu", $hold);
            $hold = str_replace("ぬ", "nu", $hold);
            $hold = str_replace("う", "u", $hold);
            $hold = str_replace("ん", "n", $hold);

            return $hold;
        }

  2. Here’s a hiragana javascript version. You could port it over by using PHP’s preg_replace

    You could also make a katakana version this way.
    However, Kanji would be a lot more complicated.

    function romajiToHiragana(hold) {
    hold = hold.replace(/tsu/g, "つ"); 
    hold = hold.replace(/kya/g, "きゃ");
    hold = hold.replace(/kyu/g, "きゅ");
    hold = hold.replace(/kyo/g, "きょ");
    hold = hold.replace(/sha/g, "しゃ");
    hold = hold.replace(/shi/g, "し"); 
    hold = hold.replace(/shu/g, "しゅ"); 
    hold = hold.replace(/sho/g, "しょ");
    hold = hold.replace(/chi/g, "ち"); 
    hold = hold.replace(/cha/g, "ちゃ"); 
    hold = hold.replace(/chu/g, "ちゅ"); 
    hold = hold.replace(/cho/g, "ちょ"); 
    hold = hold.replace(/hya/g, "ひゃ");
    hold = hold.replace(/hyu/g, "ひゅ");
    hold = hold.replace(/hyo/g, "ひょ");
    hold = hold.replace(/rya/g, "りゃ");
    hold = hold.replace(/ryu/g, "りゅ");
    hold = hold.replace(/ryo/g, "りょ");
    hold = hold.replace(/gya/g, "ぎゃ");
    hold = hold.replace(/gyu/g, "ぎゅ");
    hold = hold.replace(/gyo/g, "ぎょ");
    hold = hold.replace(/bya/g, "びゃ");
    hold = hold.replace(/byu/g, "びゅ");
    hold = hold.replace(/byo/g, "びょ");
    hold = hold.replace(/pya/g, "ぴゃ");
    hold = hold.replace(/pyu/g, "ぴゅ");
    hold = hold.replace(/pyo/g, "ぴょ");
    hold = hold.replace(/ja/g, "じゃ");
    hold = hold.replace(/ju/g, "じゅ");
    hold = hold.replace(/jo/g, "じょ");
    hold = hold.replace(/ba/g, "ば"); 
    hold = hold.replace(/da/g, "だ"); 
    hold = hold.replace(/ga/g, "が"); 
    hold = hold.replace(/ha/g, "は"); 
    hold = hold.replace(/ka/g, "か"); 
    hold = hold.replace(/ma/g, "ま"); 
    hold = hold.replace(/pa/g, "ぱ"); 
    hold = hold.replace(/ra/g, "ら"); 
    hold = hold.replace(/sa/g, "さ"); 
    hold = hold.replace(/ta/g, "た"); 
    hold = hold.replace(/wa/g, "わ"); 
    hold = hold.replace(/ya/g, "や"); 
    hold = hold.replace(/za/g, "ざ");
    hold = hold.replace(/na/g, "な"); 
    hold = hold.replace(/a/g, "あ"); 
    hold = hold.replace(/be/g, "べ"); 
    hold = hold.replace(/de/g, "で"); 
    hold = hold.replace(/ge/g, "げ"); 
    hold = hold.replace(/he/g, "へ"); 
    hold = hold.replace(/ke/g, "け"); 
    hold = hold.replace(/me/g, "め"); 
    hold = hold.replace(/pe/g, "ぺ"); 
    hold = hold.replace(/re/g, "れ"); 
    hold = hold.replace(/se/g, "せ"); 
    hold = hold.replace(/te/g, "て"); 
    hold = hold.replace(/ze/g, "ぜ"); 
    hold = hold.replace(/ne/g, "ね");
    hold = hold.replace(/e/g, "え");
    hold = hold.replace(/bi/g, "び"); 
    hold = hold.replace(/gi/g, "ぎ"); 
    hold = hold.replace(/hi/g, "ひ"); 
    hold = hold.replace(/ki/g, "き"); 
    hold = hold.replace(/mi/g, "み"); 
    hold = hold.replace(/pi/g, "ぴ"); 
    hold = hold.replace(/ri/g, "り"); 
    hold = hold.replace(/ji/g, "じ"); 
    hold = hold.replace(/ni/g, "に"); 
    hold = hold.replace(/i/g, "い");
    hold = hold.replace(/bo/g, "ぼ"); 
    hold = hold.replace(/do/g, "ど"); 
    hold = hold.replace(/go/g, "ご"); 
    hold = hold.replace(/ho/g, "ほ"); 
    hold = hold.replace(/ko/g, "こ"); 
    hold = hold.replace(/mo/g, "も"); 
    hold = hold.replace(/po/g, "ぽ"); 
    hold = hold.replace(/ro/g, "ろ"); 
    hold = hold.replace(/so/g, "そ"); 
    hold = hold.replace(/to/g, "と"); 
    hold = hold.replace(/wo/g, "を"); 
    hold = hold.replace(/yo/g, "よ"); 
    hold = hold.replace(/zo/g, "ぞ"); 
    hold = hold.replace(/no/g, "の");
    hold = hold.replace(/o/g, "お"); 
    hold = hold.replace(/bu/g, "ぶ"); 
    hold = hold.replace(/gu/g, "ぐ"); 
    hold = hold.replace(/fu/g, "ふ"); 
    hold = hold.replace(/ku/g, "く"); 
    hold = hold.replace(/mu/g, "む"); 
    hold = hold.replace(/pu/g, "ぷ"); 
    hold = hold.replace(/ru/g, "る"); 
    hold = hold.replace(/su/g, "す"); 
    hold = hold.replace(/yu/g, "ゆ"); 
    hold = hold.replace(/zu/g, "ず");
    hold = hold.replace(/nu/g, "ぬ");
    hold = hold.replace(/u/g, "う");
    hold = hold.replace(/n/g, "ん");
    return hold
}