Add Theme Support - Testimonials

gistfile1.phtml

        add_theme_support( 'myplugin-testimonials' ); // functions.php

        
        if ( function_exists('myplugin_testimonial_html') ) { myplugin_testimonial_html(); } // template file
        
        
        // Order by MENU ORDER > ASC when displayed in an archive.
        function rc_modify_query_get_design_projects( $query ) {
                if ( ! is_admin() && $query->is_main_query() && is_post_type_archive( 'testimonial' ) ) {
        	      $query->set('orderby', 'menu_order' );
        	      $query->set('order', 'ASC' );
                }
        
        }
        add_action( 'pre_get_posts', 'rc_modify_query_get_design_projects' );

 
        if ( current_theme_supports( 'onehundred-testimonials' ) ) {

                function myplugin_testimonial_page_id_meta_box() {
                        add_meta_box( 'myplugin_testimonial_page_id', __( 'Testimonial linked to this Page' ), 'myplugin_testimonial_page_id_meta_box_callback', 'page', 'normal', 'default' );
                }
                add_action( 'add_meta_boxes', 'myplugin_testimonial_page_id_meta_box' );
                        

                function myplugin_testimonial_page_id_meta_box_callback( $post ) {
                        wp_nonce_field( 'testimonial_page_id_meta_box', 'testimonial_page_id_meta_box_nonce' );

                        $value = get_post_meta( $post->ID, '_myplugin_testimonial_page_id', true );
                        $selected = isset( $value ) ? esc_attr( $value ) : '';
                        ?>
                                <p class="description"><?php _e( 'Select a customer testimonial to associate with this page. Testimonials are very effective selling tools.' ); ?></p>
                                <p>
                                <?php
                                        $args = array(
                                                'name'          => 'testimonial_page_id',
                                                'selected'      => $selected,
                                                'sort_order'    => 'ASC',
                                                'sort_column'   => 'menu_order',
                                                'hierarchical'  => 1,
                                                'post_type'     => 'testimonial'
                                        );
                                        wp_dropdown_pages( $args );
                                ?>
                                </p>
                        <?php 
                }
                        

                function myplugin_save_testimonial_page_id_meta_box_data( $post_id ) {
                        if ( ! isset( $_POST['testimonial_page_id_meta_box_nonce'] ) ) {
                                return;
                        }
                        if ( ! wp_verify_nonce( $_POST['testimonial_page_id_meta_box_nonce'], 'testimonial_page_id_meta_box' ) ) {
                                return;
                        }
                        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
                                return;
                        }
                        if ( ! current_user_can( 'edit_page', $post_id ) ) {
                                return;
                        } 
                        if ( isset( $_POST['testimonial_page_id'] ) ) {
                                $value = $_POST['testimonial_page_id'];

                                if ( absint( $value ) ) {
                                        update_post_meta( $post_id, '_myplugin_testimonial_page_id', $value );
                                }
                        }
                }
                add_action( 'save_post', 'myplugin_save_testimonial_page_id_meta_box_data' );


                function myplugin_testimonial_html() {
                        if ( ! is_page() ) {
                                return;
                        }

                        global $post;

                        $testimonial_id = get_post_meta( $post->ID, '_myplugin_testimonial_page_id', true );
                
                        if ( $testimonial_id ) {
                                $args = array(
                                        'p' => $testimonial_id,
                                        'post_type' => 'testimonial',
                                );
                                $query = new WP_Query( $args );
                                if ( $query->have_posts() ) { ?>
                                        <div class="container"><?php 
                                                while ( $query->have_posts() ) : $query->the_post(); ?>
                                                        <blockquote class="featured-quote"><?php the_excerpt(); ?> - <a><cite><?php the_title(); ?></cite></a></blockquote><?php
                                                endwhile;
                                                wp_reset_postdata(); ?> 
                                        </div><?php 
                                }
                        }

                }

        }