Site Links Search Box: Schema markup for WordPress

add_action( 'wp_head', 'cyb_add_search_box_schemas' );
function cyb_add_search_box_schemas() {
    if ( is_front_page() && (int) get_query_var( 'paged', 0 ) < 1 ) {
			
		// Add schemas site markup for Site Name and Site Link search box.
		// See https://developers.google.com/structured-data/slsb-overview
		// and https://developers.google.com/structured-data/site-name
		$searchbox = [
			'@context'         => esc_js( 'http://schema.org' ),
			'@type'           => 'WebSite',
			'name'            => esc_js( get_bloginfo('name') ),
			'url'             => esc_js( home_url() ),
			'potentialAction' => [
			    '@type'       => "SearchAction",
				'target'      => esc_js( home_url( '?s={search_term}' ) ),
				'query-input' => "required name=search_term"
			]
		];

		?>
		<script type="application/ld+json">
			<?php echo wp_json_encode( $searchbox ); ?>
		</script>
		<?php
    }
}