Adding Custom Google Search to header

I have the same question and the same lack of success with the php code above… Trying to put the search form on my 404 page instead of the default search. Mine also works fine in the widget. Thank you!

I ended up having to create a widget area.
This is in my Theme Functions.

/**
 * Register Widget Area.
 *
 */
function search_widget_init() {

	register_sidebar( array(
		'name' => 'Google Search',
		'id' => 'google-search',
	) );
}
add_action( 'widgets_init', 'search_widget_init' );

And this is in my header.

<div id="search" class="col-lg-2 col-md-2 column">
	<?php if ( is_active_sidebar( 'google-search' ) ) : ?>
		<?php dynamic_sidebar( 'google-search' ); ?>
	<?php endif; ?>
</div>

Thank you!

The second form of the first post have to be working if you insert it to a place where html body content can be displayed. This ‘place’ can be the post part or page header (but not the html head section, because it is outside of html body) or footer, or any sidebar or widget, …

<?php echo do_shortcode('[wp_google_searchbox]'); ?>

For example this code is display the search box at the beginning of every post, if you include this into your functions.php of your active theme:

function the_content_wgs( $content ) {
	$content = do_shortcode('[wp_google_searchbox]') . $content; 
	return $content;
}
add_filter( 'the_content', 'the_content_wgs', 30, 1 );