Remove echo from function - WordPress - php

Question

I'm trying to accomplish an hard task. The task is removing a echo from a Yoast SEO file using the available WP hooks.
class-frontend.php
public function head() {
global $wp_query;
$old_wp_query = null;
if ( ! $wp_query->is_main_query() ) {
$old_wp_query = $wp_query;
wp_reset_query();
}
/**
* Action: 'wpseo_head' - Allow other plugins to output inside the Yoast SEO section of the head section.
*/
do_action( 'wpseo_head' );
echo '<!-- / ', $this->head_product_name(), ". -->\n\n"; // <-- remove this
if ( ! empty( $old_wp_query ) ) {
$GLOBALS['wp_query'] = $old_wp_query;
unset( $old_wp_query );
}
return;
}
Is there a way to override this function and remove the echo using the available WP hooks? Or is there a better way to do this?
Many thanks.

Answer 1

There is a post at wordpress.stackexchange that indicates you can output buffer using the hooks get_header and wp_head to filter that out:
add_action('get_header', 'ad_ob_start');
add_action('wp_head', 'ad_ob_end_flush', 100);
function ad_ob_start() {
ob_start('ad_filter_wp_head_output');
}
function ad_ob_end_flush() {
ob_end_flush();
}
function ad_filter_wp_head_output($output) {
if (defined('WPSEO_VERSION')) {
$output = str_ireplace('<!-- / Yoast WordPress SEO plugin. -->', '', $output);
}
return $output;
}
That expects your $this->head_product_name() to be / Yoast WordPress SEO plugin. so you may have to alter that...or if you want it to remove "anythere" there, you can change your replacement to something like this:
$output = preg_replace('/<!-- .* -->/Us', '', $output);
But that will remove ALL comments, and it will be slower than the string replace.