Произвольное поле после заголовка в редакторе статей

Add post field

add_action( 'edit_form_after_title', 'artabr_add_post_field_title' );
function artabr_add_post_field_title() {
	global $post;
	if ( get_post_type( $post ) != 'artabr-service' ) {
		return false;
	}
	$value = get_post_meta( $post->ID, 'service_title', true );
	?>
	<style>
		#service_title {
			padding: 3px 8px;
			font-size: 1.7em;
			line-height: 100%;
			height: 1.7em;
			width: 100%;
			outline: 0;
			margin: 0 0 3px;
			background-color: #fff;
		}
		
		#service-text-label {
			color: #72777c;
			position: absolute;
			font-size: 1.7em;
			padding: 11px 10px;
			cursor: text;
		}
	</style>	<label id="service-text-label" for="service_title"></label>	<input type="text" size="30"
		value="<?php echo $value ?>" name="service_title" id="service_title"
		placeholder="Введите заголовок карточки"/>    <?php
}

add_action( 'save_post', 'artabr_save_post_field_title' );
function artabr_save_post_field_title( $postid ) {
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return false;
	}
	if ( ! current_user_can( 'edit_page', $postid ) ) {
		return false;
	}
	if ( isset( $_POST['_inline_edit'] ) && wp_verify_nonce( $_POST['_inline_edit'], 'inlineeditnonce' ) ) {
		return;
	}
	if ( empty( $postid ) || ( ! empty( $_POST['post_type'] ) && $_POST['post_type'] != 'artabr-service' ) ||
	     ( ! empty( $_GET['post_type'] ) && $_GET['post_type'] != 'artabr-service' )
	) {
		return false;
	}
	$addon_service_title = sanitize_text_field( $_POST['service_title'] );
	add_post_meta( $postid, 'service_title', $addon_service_title, true );
	/* check if the custom field is submitted (checkboxes that aren't marked, aren't submitted) */
	if ( isset( $addon_service_title ) ) {
		/* store the value in the database */
		update_post_meta( $postid, 'service_title', $addon_service_title );
	} else {
		/* not marked? delete the value in the database */
		delete_post_meta( $postid, 'service_title' );
	}
}