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[PHP]マルチバイト対応のwordwrapが無いから作った

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wordwrapのマルチバイト対応のものを漁ってみましたが、smartyを入れないといけなかったり(面倒)、
なんか不安。要するに似た動きしてくれて、内部コードが保証されててメンテしやすければOK!

これでどうだ!

mb_wordwrap
public function mb_wordwrap( $str, $width=35, $break=PHP_EOL )
{
    $c = mb_strlen($str);
    $arr = [];
    for ($i=0; $i<=$c; $i+=$width) {
        $arr[] = mb_substr($str, $i, $width);
    }
    return implode($break, $arr);
}

基本的に日本語横書き文書は35文字で改行し、単語を途中で切るのも受け入れられているし(ただ、とんでもない意味の語彙に変化することがあるが…)これでよし。

ほら〜期待通り動く。ソースの見通しもいいね。

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