CSV writer helper method

gistfile1.txt

    /**
     * Writes an array of arrays to a CSV file.
     *
     * @param string[] $headers
     *   The names of the table columns. Pass an empty array if you don't want any headers (e.g. if you're appending to
     *   an existing file.
     * @param array[] $data
     *   Data to write. Each top-level array should contain an array the same length as the $header array.
     * @param string $filename
     * @param bool $append
     *   Whether to append to the file if it exist or overwrite from the beginning of the file.
     * @param string $path
     */
    public static function csv(array $headers, array $data, string $filename, $append = false, $path = 'data/')
    {
        if ($headers && $data) {
            if (count($headers) !== count(reset($data))) {
                throw new \InvalidArgumentException(
                    'The length of the `$header` array must equal the length of each of the arrays in `$data`'
                );
            }
        }

        $mode = ($append) ? 'a' : 'w';

        $fp = fopen($path . $filename, $mode);
        if ($headers) {
            if ($append === false) {
                fputcsv($fp, $headers);
            }
            else {
                if (filesize($path . $filename) === 0) {
                    fputcsv($fp, $headers);
                }
            }
        }
        foreach ($data as $datum) {
            fputcsv($fp, $datum);
        }
        fclose($fp);
    }