write utf-8 characters to file with fputcsv in php
Try this:
$df = fopen($filepath, 'w');
fprintf($df, chr(0xEF).chr(0xBB).chr(0xBF));
fputcsv($df, array($coupon->code, $discount->label));
the line fprintf($df, chr(0xEF).chr(0xBB).chr(0xBF)); writes file header for correct encoding.
Try this also:
$df = fopen($filepath, 'w');
$array = array($coupon->code, $discount->label);
$array = array_map("utf8_decode", $array);
fputcsv($df, $array);