Data.php

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<?php
namespace Magento\Framework\Url\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    public function getCurrentBase64Url()
    {
        return $this->urlEncoder->encode($this->_urlBuilder->getCurrentUrl());
    }

    public function getEncodedUrl($url = null)
    {
        if (!$url) {
            $url = $this->_urlBuilder->getCurrentUrl();
        }
        return $this->urlEncoder->encode($url);
    }

    public function addRequestParam($url, $param)
    {
        $startDelimiter = false === strpos($url, '?') ? '?' : '&';

        $arrQueryParams = [];
        foreach ($param as $key => $value) {
            if (is_numeric($key) || is_object($value)) {
                continue;
            }

            if (is_array($value)) {
                // $key[]=$value1&$key[]=$value2 ...
                $arrQueryParams[] = $key . '[]=' . implode('&' . $key . '[]=', $value);
            } elseif ($value === null) {
                $arrQueryParams[] = $key;
            } else {
                $arrQueryParams[] = $key . '=' . $value;
            }
        }
        if (!empty($arrQueryParams)) {
            $url .= $startDelimiter . implode('&', $arrQueryParams);
        }

        return $url;
    }

    public function removeRequestParam($url, $paramKey, $caseSensitive = false)
    {
        $regExpression = '/\\?[^#]*?(' . preg_quote($paramKey, '/') . '\\=[^#&]*&?)/' . ($caseSensitive ? '' : 'i');
        while (preg_match($regExpression, $url, $matches) !== 0) {
            $paramString = $matches[1];
            // if ampersand is at the end of $paramString
            if (substr($paramString, -1, 1) != '&') {
                $url = preg_replace('/(&|\\?)?' . preg_quote($paramString, '/') . '/', '', $url);
            } else {
                $url = str_replace($paramString, '', $url);
            }
        }
        return $url;
    }
}