Page::getLink() 

\nn\t3::Page()->getLink($pidOrParams = NULL, $params = [], $absolute = false); 

Generate a simple link to a page in the frontend.

Works in any context - both from a backend module or scheduler/CLI job, as well as in the frontend context, e.g. in the controller or a ViewHelper. Absolute URLs are generated from the backend context into the frontend. The URLs are encoded as readable URLs - the slug path or RealURL are taken into account.

\nn\t3::Page()->getLink( $pid );
\nn\t3::Page()->getLink( $pid, $params );
\nn\t3::Page()->getLink( $params );
\nn\t3::Page()->getLink( $pid, true );
\nn\t3::Page()->getLink( $pid, $params, true );
\nn\t3::Page()->getLink( 'david@99grad.de' )
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Example for generating a link to a controller:

Tip: see also \nn\t3::Page()->getActionLink() for a short version!

$newsDetailPid = 123;
$newsArticleUid = 45;

$link = \nn\t3::Page()->getLink($newsDetailPid, [
    'tx_news_pi1' => [
        'action' => 'detail',
        'controller' => 'news',
        'news' => $newsArticleUid,
    ]
]);
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| @return string

Source Code 

public function getLink ( $pidOrParams = null, $params = [], $absolute = false ) {
	$pid = is_array($pidOrParams) ? $this->getPid() : $pidOrParams;
	$params = is_array($pidOrParams) ? $pidOrParams : $params;
	if ($params === true) {
		$params = [];
		$absolute = true;
	}
	$request = \nn\t3::Environment()->getRequest();
	$cObj = GeneralUtility::makeInstance( \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::class );
	$cObj->setRequest( $request );
	$uri = $cObj->typolink_URL([
		'parameter' => $pid,
		'forceAbsoluteUrl' => ($absolute == true),
		'additionalParams' => GeneralUtility::implodeArrayForUrl('', $params),
	]);
	return $uri;
}
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