Yes. You can take advantage of this to enable or disable features in your plugin if a theme does or does not declare support for a feature. WooCommmerce is an example of a plugin that does this.
Option 1 is the solution, here’s a smaller example: $obj = new Obj(); …. register_block_type( ‘my-plugin/my-block’, [ ‘editor_script’ => ‘editor-script-handle’, ‘render_callback’ => [ $obj, ‘block_save_function’ ] ] ); In that code [ $obj, ‘block_save_function’ ] is equivalent to $obj->block_save_function(…. The important thing to note, is that render_callback‘s value is a PHP callable type. You need … Read more
The answer is that you should not check if wp_nonce_field() exists before using it! The recommendation to perform the check assumes that you want to be compatible with versions of WordPress from before the function existed. If Rarst is right that it was introduced in 2.0.4 then you should NOT be supporting earlier versions, as … Read more
Creating Admin Themes article in Codex shows you how to add css styles to admin pages
The hierarchy of storing data roughly goes like this (from less functional/complex to more): Transients API Options API Settings API Database Tables Custom file cache Since from your description Options are too limited and database too complex, I would look at Settings.
I guess it doesn’t need anymore explanation: $mymenu = wp_get_nav_menu_object(‘Main Navigation Menu’); $menuID = (int) $mymenu->term_id; $myPage = get_page_by_title(‘About Us’); $itemData = array( ‘menu-item-object-id’ => $myPage->ID, ‘menu-item-parent-id’ => 0, ‘menu-item-position’ => 2, ‘menu-item-object’ => ‘page’, ‘menu-item-type’ => ‘post_type’, ‘menu-item-status’ => ‘publish’ ); wp_update_nav_menu_item($menuID, 0, $itemData);
The handle_upload hook is called after wp_handle_upload is run, and it sends in a named array consisting of ‘file’, ‘url’ & ‘type’. You could possibly use code like this to utilise it, depending on what you need to achieve: function process_images($results) { if( $results[‘type’] === ‘image/jpeg’ ) { // or /png or /tif / /whatever … Read more
WordPress already ships with jQuery. There is no need to include it in your theme. Javascript Let’s say your jquery.tabify.js file is located in /js/jquery.tabify.js in your theme. Include the following code in your functions.php file: function jquery_tabify() { wp_enqueue_script( ‘jquery-tabify’, get_template_directory_uri() . ‘/js/jquery.tabify.js’, array( ‘jquery’ ) ); } add_action( ‘wp_enqueue_scripts’, ‘jquery_tabify’ ); This will … Read more
I agree with Goran on editing the core files. It should not be done. But, if a user has dimensions in the name of the image, they will also be replaced and the image won’t display with this regular expression. Instead, you can create a new function in your theme’s functions.php file. Something like this: … Read more
Usually a plugin developed in WordPress version will run fine on several newer versions. What you need to care about is ‘deprecated` features/apis in WordPress. Any API in WordPress is not removed overnight, rather it remains deprecated for several versions. You will get such a list here: http://codex.wordpress.org/Category:Deprecated_Functions When you develop a plugin, you can … Read more