php + fgetcsv不支持某些特殊字符

while (($data = fgetcsv($file, 0, ';')) !== false) {
    // 处理数据
}

while (($data = fgetcsv($file, 0, ',')) !== false) {
    $data = array_map(function ($value) {
        return mb_convert_encoding($value, 'UTF-8', '原始编码');
    }, $data);
    // 处理数据
}

$csvString = "字段1,字段2,字段3\n字段4,字段5,字段6";
$data = str_getcsv($csvString, ',', '"', '\\');

function custom_csv_parser($line, $delimiter = ',', $enclosure = '"', $escape = '\\') {
    $result = [];
    $currentField = '';
    $inEnclosure = false;
    $fieldCount = 0;

    for ($i = 0; $i < strlen($line); $i++) {
        $char = $line[$i];

        if ($char == $enclosure) {
            $inEnclosure = !$inEnclosure;
        } elseif ($char == $delimiter && !$inEnclosure) {
            $result[] = $currentField;
            $currentField = '';
            $fieldCount++;
        } else {
            $currentField .= $char;
        }
    }

    $result[] = $currentField; // 添加最后一个字段
    return $result;
}

$csvString = "字段1,字段2,字段3\n字段4,字段5,字段6";
$data = custom_csv_parser($csvString);