回答編集履歴
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            add_meta_box(
         
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            'dess_post_settings',
         
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            __('Post Settings',''),
         
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            //_notice_meta_box_callbackに注目してください。メタボックスにフォームフィールドを表示する関数
         
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            'dess_post_meta_box_callback',
         
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            'post'
         
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            );
         
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            }
         
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            add_action( 'add_meta_boxes', 'dess_post_meta_box' );
         
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            //「投稿」にメタボックスを追加する add_meta_boxes s 複数形
         
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            function dess_post_meta_box_callback( $post ) {
         
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            wp_nonce_field( 'dess_post_save_meta_box_data', 'dess_post_meta_box_nonce' );
         
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            //slider in slider post id in meta box 
         
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            $show_in_slider = get_post_meta( $post->ID, 'show_in_slider', true );
         
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            //show in homepage post id in meta box
         
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            $show_in_homepage = get_post_meta( $post->ID, 'ex_show_in_homepage', true );
         
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            //page_featured_type post id
         
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            $type = get_post_meta( $post->ID, 'page_featured_type', true );
         
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            //投稿編集画面のメタボックスhtml
         
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            echo '<p><label for="show_in_slider">'.__('Show in Slider','').': </label>';
         
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            //slider in slider post id from  meta box 
         
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            echo '<input type="checkbox" id="show_in_slider" name="show_in_slider" value="Yes" '.($show_in_slider ==  'Yes' ? 'checked' : '' ).' /></p>';
         
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            echo '<p><label for="show_in_homepage">Show in Homepage: </label>';
         
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            //show in homepage post id from meta box
         
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            echo '<input type="checkbox" id="show_in_homepage" name="ex_show_in_homepage" value="Yes" '.($show_in_homepage ==  'Yes' ? 'checked' : '' ).' /></p>';
         
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            echo '<p><label for="video_type">'.__('Featured Type','').': </label><br/>';
         
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            echo '<select id="video_type" name="dess_post[page_featured_type]"><option value="">Image</option><option value="youtube" '.($type == 'youtube' ? 'selected="selected"' : '').'>Youtube</option><option value="vimeo" '.($type == 'vimeo' ? 'selected="selected"' : '').'>Vimeo</option></select></p>';
         
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            echo '<p><label for="video_id">'.__('Video ID','').': </label><br/>';
         
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            echo '<input type="text" id="video_id" name="dess_post[page_video_id]" value="'.get_post_meta( $post->ID, 'page_video_id', true ).'" /></p>';
         
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            }
         
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            function dess_post_save_meta_box_data( $post_id ) {
         
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            if ( ! isset( $_POST['dess_post_meta_box_nonce'] ) ) {
         
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            return;
         
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            }
         
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            if ( ! wp_verify_nonce( $_POST['dess_post_meta_box_nonce'], 'dess_post_save_meta_box_data' ) ) {
         
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            return;
         
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            }
         
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            if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
         
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            return;
         
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            }
         
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            if ( isset( $_POST['post_type'] ) && 'page' == $_POST['post_type'] ) {
         
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            if ( ! current_user_can( 'edit_page', $post_id ) ) {
         
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            return;
         
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            }
         
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            } else {
         
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            if ( ! current_user_can( 'edit_post', $post_id ) ) {
         
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            return;
         
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            }
         
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            }
         
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            $show_in_slider = sanitize_text_field( $_POST['show_in_slider'] );
         
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            $show_in_slider = sanitize_text_field( $_POST['ex_show_in_homepage'] );
         
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            update_post_meta( $post_id, 'show_in_slider', $show_in_slider );
         
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            update_post_meta( $post_id, 'ex_show_in_homepage', $show_in_homepage );
         
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            $arr = array();
         
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            if (isset($_POST['dess_post'])){
         
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            $arr = $_POST['dess_post'];
         
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            }
         
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            foreach ($arr as $key => $value) {
         
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            $val = sanitize_text_field($value);
         
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            update_post_meta( $post_id, $key, $val );
         
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            }
         
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            }
         
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            ```
         
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            ssssssssssssssssssssssss
         
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            skdnsndaknsd, sdad
         
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