t1gor/Robots.txt-Parser-Class

<?php declare(strict_types=1);

namespace t1gor\RobotsTxtParser\Stream\Filters;

use t1gor\RobotsTxtParser\Stream\CustomFilterInterface;

class TrimSpacesLeftFilter extends \php_user_filter implements CustomFilterInterface {

    public const NAME = 'RTP_trim_spaces_both';

    public $filtername = self::NAME;

    public function filter($in, $out, &$consumed, $closing) {
        while ($bucket = stream_bucket_make_writeable($in)) {
            $bucket->data = preg_replace('/(^\s+)(?!\n$)/mui', '', $bucket->data);
            $consumed += $bucket->datalen;
            stream_bucket_append($out, $bucket);
        }

        return PSFS_PASS_ON;
    }
}