Increases the weight for specified HTML tags

Relevanssi HTML Tag Weights

<?php

function rlv_html_tag_boost( $content ) {
	$weightings = [
		'h1' => 5,
		'h2' => 4,
		'h3' => 2,
		'strong' => 1,
	];
	foreach ( $weightings as $tag => $weight ) {
		if ( preg_match_all( "#<$tag.*?>(.*?)</$tag>#", $content, $elements ) ) {
			foreach ( $elements[1] as $el_content ) {
				while ( 0 < $weight-- ) {
					$content .= " $el_content";
				}
			}
		}
	}
	return $content;
}
add_filter( 'relevanssi_post_content', 'rlv_html_tag_boost' );

Now included in the Relevanssi knowledge base.