Convert headers to Japanese. Here is a process of rewriting from [PATTERN] below to [TO STRING]

convert_header.php

<?php

$strCsvFilePath = DIR_CSV . $strCsvFileName;    // SaveDir
$strCsvDownloadUrl = URL_HOST . 'csv/' . $strCsvFileName;    // Download Url

mb_language("Japanese");

// Header
$strCsvFileText = file_get_contents($strCsvFilePath);
$from_encoding = CSV_ENCODE_AFTER;
foreach (array('UTF-8', 'SJIS', 'EUC-JP', 'ASCII', 'JIS') as $charcode) {
    if (strcmp(mb_convert_encoding($strCsvFileText, $charcode, $charcode), $strCsvFileText) == 0) {
        $from_encoding = $charcode;
        break;
    }
}


// TODO: Convert headers to Japanese
// TODO: Hint: There is a process of rewriting from [PATTERN] below to [TO STRING].
// TODO: Hint: Please correct it and use it.
// TODO: Hint: Add it elsewhere if necessary.
$strCsvFileText = mb_convert_encoding($strCsvFileText, "SJIS-win", $from_encoding);
$strCsvFileText = mb_ereg_replace("PATTERN", mb_convert_encoding("TO STRING", "SJIS-win", "UTF-8"), $strCsvFileText);

file_put_contents($strCsvFilePath, $strCsvFileText);