Using League\Csv with stream filter

stream_filter.php

<?php
 
stream_filter_register("utf8encode", "Utf8EncodeFilter");
class Utf8EncodeFilter extends php_user_filter
{
    function filter($in, $out, &$consumed, $closing)
    {
        while ($bucket = stream_bucket_make_writeable($in)) {
            $bucket->data = utf8_encode($bucket->data);
            $consumed += $bucket->datalen;
            stream_bucket_append($out, $bucket);
        }
        return PSFS_PASS_ON;
    }
}

$path = '/path/to/my/iso-8859-15-file.csv';
$stream_filter_path = 'php://filter/read=utf8encode/resource='.$path;
$csv = new \League\Csv\Reader($stream_filter_path);

//the CSV is directly transcoded in UTF-8 you don't need to use $csv->setEncoding anymore !!