Highlight current page

I have found the below code in the plugin which I want to change to be something like, if on the current page add a ‘active’ class but all other links on this page not show this class.

if ( !function_exists( 'related_links' ) ) {
function related_links()
{
	$related_links = get_related_links(); ?>
	<?php if ( !empty( $related_links ) ) : ?>
	<ul class="related-links-list">
	<?php foreach ( $related_links as $link ): ?>
		<li><a href="<?php echo $link['url']; ?>"><?php echo $link['title']; ?></a></li>
	<?php endforeach; ?>
	</ul>
	<?php endif; ?>
	<?php
}
}

?>

I have amended the code to the below, but it shows a class for all links, can anyone help in only showing the class for the link of the page I am currently on

if ( !function_exists( 'related_links' ) ) {
function related_links()
{
	$related_links = get_related_links(); ?>
	<?php if ( !empty( $related_links ) ) : ?>
	<ul class="related-links-list">
	<?php foreach ( $related_links as $link ): ?>
        <li><a href="<?php echo $link['url']; ?>" class="<?php if (is_page( basename(get_permalink()) )) echo 'active'; ?>" ><?php echo $link['title']; ?></a></li>
	<?php endforeach; ?>
	</ul>
	<?php endif; ?>
	<?php
}
}

?>