Csv.php

<?php

class Csv
{
    public static function fromArray($rows, $delimiter = ',')
    {
        if (empty($rows)) {
            return '';
        }

        // Limit CSV to 32 MB in memory
        $handle = fopen('php://temp/maxmemory:'. (32*1024*1024), 'r+');

        // Write Byte Order Mark for UTF-8
        fputs($handle, chr(0xEF) . chr(0xBB) . chr(0xBF));

        $headers = array_keys(array_values($rows)[0]);
        fputcsv($handle, $headers, $delimiter);

        foreach ($rows as $row) {
            fputcsv($handle, array_values($row), $delimiter);
        }

        rewind($handle);

        return stream_get_contents($handle);
    }

    public static function toArray($csvString, $delimiter = ',')
    {
        if (is_resource($csvString)) {
            $handle = $csvString;
        } else {
            $handle = fopen('php://memory','r+');
            fwrite($handle, (string) $csvString);
            rewind($handle);
        }

        $rows = [];
        while ($row = fgetcsv($handle, 0, $delimiter)) {

            $rows[] = array_map(function($value) {
                return static::convertEncoding($value);
            }, $row);
        }

        $headers = array_shift($rows);
        $headers = array_map('trim', $headers);

        $data = array_map(function($row) use($headers) {
            return array_combine($headers, $row);
        }, $rows);

        return $data;
    }

    public static function convertEncoding($input)
    {
        return iconv(mb_detect_encoding($input, mb_detect_order(), true), 'UTF-8//IGNORE', $input);
    }
}