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PHPでExcelで開いても文字化けしないCSVを出力する

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最後にUTF-8からSJISに変換します。

//$dataがCSVで出力するデータ(キーがa,b,c,dの連想配列を想定)
foreach ($data as $key => $value) {
        //CSVに書きだす内容をカンマ区切りにする
        $csv .=  $value['a'] . ',';
        $csv .=  $value['b'] . ',';
        $csv .=  $value['c'] . ',';
        $csv .=  $value['d'] . ',';
        $csv .=  "\n"; 
    }


    header("Content-Type: application/octet-stream");
    //$filenameにファイル名を指定
    header("Content-Disposition: attachment; filename=$filename");
    //Excelで開くようにSJISにする
    echo mb_convert_encoding($csv,"SJIS", "UTF-8");

上記コードだと、改行・カンマが含まれていると正しいCSVが作成できないとご指摘頂いたので、修正。

<?php

$data = array('hoge,fuga', "hoge\nfuga");
$csv = '';
$filename = 'test.csv';

foreach ($data as $key => $value) {
    //カンマ対応
    $value = str_replace(',', '","', $value);
    //改行対応
    $value = str_replace("\n", chr(10), $value);
    $csv .=  $value . ',';
    $csv .=  "\n"; 
}

    header("Content-Type: application/octet-stream");
    header("Content-Disposition: attachment; filename=$filename");
    echo mb_convert_encoding($csv,"SJIS", "UTF-8");

こちらの方法でも可能とのことです!

$fp = fopen('php://output', 'w');
stream_filter_prepend($fp,'convert.iconv.utf-8/cp932');
fputcsv($fp,$header);
foreach($rows as $row){
    fputcsv($fp,$row);
}
plaid
CXプラットフォーム「KARTE」の開発・運営、EC特化型メディア「Shopping Tribe」の企画・運営、CX特化型メディア「XD(クロスディー)」の企画・運営
https://plaid.co.jp/
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