genesis-simple-sidebars/includes/inpost.php

<?php
add_action('admin_menu', 'ss_add_inpost_metabox');
/**
 * This bit of code registers the meta box on posts/pages,
 * so that users can choose what sidebar to use.
 */
function ss_add_inpost_metabox() {

	foreach ( (array) get_post_types( array( 'public' => true ) ) as $type ) {

		if ( post_type_supports( $type, 'genesis-simple-sidebars' ) || $type == 'post' || $type == 'page' ) {
			add_meta_box( 'ss_inpost_metabox', __( 'Sidebar Selection', 'genesis-simple-sidebars' ), 'ss_inpost_metabox', $type, 'side', 'low' );
		}

	}

}

function ss_inpost_metabox() {

	$_sidebars = stripslashes_deep( get_option( SS_SETTINGS_FIELD ) );
	global $wp_registered_sidebars;

?>

	<input type="hidden" name="ss_inpost_nonce" value="<?php echo wp_create_nonce( plugin_basename( __FILE__ ) ); ?>" />

<?php
	if( isset( $wp_registered_sidebars['sidebar'] ) ) {
?>

	<p>
		<label class="howto" for="_ss_sidebar"><span><?php echo esc_attr( $wp_registered_sidebars['sidebar']['name'] ); ?><span></label>
		<select name="_ss_sidebar" id="_ss_sidebar" style="width: 99%">
			<option value=""><?php _e( 'Default', 'genesis-simple-sidebars' ); ?></option>
			<?php
			foreach ( (array) $_sidebars as $id => $info ) {
				printf( '<option value="%s" %s>%s</option>', esc_html( $id ), selected( $id, genesis_get_custom_field( '_ss_sidebar' ), false), esc_html( $info['name'] ) );
			}
			?>
		</select>
	</p>
<?php
	}
	if( isset( $wp_registered_sidebars['sidebar-alt'] ) ) {
?>
	<p>
		<label class="howto" for="_ss_sidebar_alt"><span><?php echo esc_attr( $wp_registered_sidebars['sidebar-alt']['name'] ); ?><span></label>
		<select name="_ss_sidebar_alt" id="_ss_sidebar_alt" style="width: 99%">
			<option value=""><?php _e( 'Default', 'genesis-simple-sidebars' ); ?></option>
			<?php
			foreach ( (array) $_sidebars as $id => $info ) {
				printf( '<option value="%s" %s>%s</option>', esc_html( $id ), selected( $id, genesis_get_custom_field( '_ss_sidebar_alt' ), false ), esc_html( $info['name'] ) );
			}
			?>
		</select>
	</p>

<?php
	}
}

add_action( 'save_post', 'ss_inpost_metabox_save', 1, 2 );
/**
 * This bit of code saves the sidebars chosen as post meta.
 */
function ss_inpost_metabox_save( $post_id, $post ) {

	//* verify the nonce
	if ( !isset($_POST['ss_inpost_nonce']) || !wp_verify_nonce( $_POST['ss_inpost_nonce'], plugin_basename(__FILE__) ) )
		return $post->ID;

	//* don't try to save the data under autosave, ajax, or future post.
	if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;
	if ( defined('DOING_AJAX') && DOING_AJAX ) return;
	if ( defined('DOING_CRON') && DOING_CRON ) return;

	//* is the user allowed to edit the post or page?
	if ( ( 'page' == $_POST['post_type'] && ! current_user_can( 'edit_page', $post->ID ) ) || ! current_user_can( 'edit_post', $post->ID ) )
		return $post->ID;

	$_sidebars = array(
		'_ss_sidebar'     => $_POST['_ss_sidebar'],
		'_ss_sidebar_alt' => $_POST['_ss_sidebar_alt'],
	);

	//* store the custom fields
	foreach ( $_sidebars as $key => $value ) {

		//* don't try to store data during revision save
		if ( 'revision' === $post->post_type )
			return;

		if ( $value ) {
			update_post_meta($post->ID, $key, $value);
		} else {
			delete_post_meta($post->ID, $key);
		}

	}

}