*/ class Amp_WP_Meta_Box { public function __construct() { // Action -> Init Metabox add_action( 'add_meta_boxes', array( $this, 'append_meta_boxes' ) ); // Action -> Save Metabox. add_action( 'save_post', array( $this, 'save_metaboxes' ) ); } /** * Add Meta Box For Posts/Pages. * * @since 1.0.0 */ public function append_meta_boxes() { add_meta_box( 'amp-wp-settings', esc_html__( 'AMP WP Settings', 'amp-wp' ), array( $this, 'amp_wp_metabox_output' ), array( 'post', 'page' ), 'side', 'low' ); } /** * Add job data meta box options. * * @since 1.0.0 */ public static function amp_wp_metabox_output() { // Add a nonce field so we can check for it later. wp_nonce_field( 'amp-wp-meta-box', 'amp-wp-meta-box-nonce' ); Amp_WP_Meta_Box::checkbox('enable', esc_html__('Disable AMP Version', 'amp-wp'), ''); } /* * Metabox * * @since 1.0.0 * * @param string $id field id * @param string $label field lable * @param string $desc field description * @return void */ public static function checkbox($id, $label, $desc = '') { global $post; $html = '

'; $html .= ''; $html .= 'ID, 'disable-amp-wp', true ) ).' />'; if ($desc) { $html .= '' . $desc . ''; } $html .= '

'; echo $html; } /** * Callback to save post metabox * * @since 1.0.0 * * @param int $post_id */ public function save_metaboxes( $post_id ) { if( 'POST' !== $_SERVER['REQUEST_METHOD'] ) { return; } /** * We need to verify this came from our screen and with proper authorization, * because the save_post action can be triggered at other times. */ // Check if nonce is set. if( null == filter_input( INPUT_POST, 'amp-wp-meta-box-nonce' ) ) { return; } // Verify that the nonce is valid. check_admin_referer( 'amp-wp-meta-box', 'amp-wp-meta-box-nonce' ); // If this is an autosave, our form has not been submitted, so we don't want to do anything. if( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) { return; } // Check the user's permissions. if( !current_user_can( 'edit_post', $post_id ) ) { return; } $amp_wp_enable = filter_input( INPUT_POST, 'amp-wp-enable' ); if( empty( $amp_wp_enable ) ) { delete_post_meta( $post_id, 'disable-amp-wp' ); } else { update_post_meta( $post_id, 'disable-amp-wp', '1' ); } } } new Amp_WP_Meta_Box();