For testing purposes you can use the log system (php_error.log): error_log(‘Plugin activated’, 0); // Check for DB table existance if(!$this->hasDBTable()){ error_log(‘Database not present’, 0); if($this->createCELabelsDBTables()){ error_log(‘Database was created.’, 0); } else { error_log(‘Error creating the CE Labels Plugin db tables!’, 0); } } else { error_log(‘Database OK’, 0); } To output error to the user … Read more
global $wpdb; $image_src = wp_upload_dir()[‘baseurl’] . “https://wordpress.stackexchange.com/” . _wp_relative_upload_path( $filename ); $query = “SELECT COUNT(*) FROM {$wpdb->posts} WHERE guid=’$image_src'”; $count = intval($wpdb->get_var($query)); You can use this at the top of your code. Then check the value of $count. If it’s 0, then you can continue adding the attachment
There is already a huge list built for you, which can be returned by wp_kses_allowed_html() based on context, and filtered via the wp_kses_allowed_html filter, also contextually. Creating that list should not be hard. However, “the whole range of HTML tags that might appear in an HTML email” should be pretty close to the range allowed … Read more
The question / answer you are referring to was Tips for using WordPress as a CMS. The screenshots posted in that answer were created using the register_meta_box_cb argument that is available to for custom post types. register_meta_box_cb must specify a callback function that contains the code for the meta box. To create the meta box … Read more
You can use the theme_page_templates filter to add templates to the dropdown list of page templates like this: function wpse255804_add_page_template ($templates) { $templates[‘my-custom-template.php’] = ‘My Template’; return $templates; } add_filter (‘theme_page_templates’, ‘wpse255804_add_page_template’); Now WP will be searching for my-custom-template.php in the theme directory, so you will have to redirect that to your plugin directory by … Read more
More than an Answer, this is a research and a compilation. Database Description already in Damien answer. A Google search reveals this in WordPress forums: UML documentation of WordPress As far as I know, that’s all we have. If you want to write one, I’m sure it’d be welcomed 🙂 (Ipstenu, referring to the Database … Read more
Given that all of the libraries you need for the datepicker are bundled with WordPress and are registered with all of the appropriate dependencies, all you really need to do is: function enqueue_my_scripts_wpse_97533() { wp_enqueue_script(‘jquery-ui-datepicker’); } add_action(‘wp_enqueue_scripts’,’enqueue_my_scripts_wpse_97533′); If you then look at the source of the page you will see that jQuery, jQuery-UI, and jQuery-UI-Datepicker … Read more
The wp_capabilities saves the value as serilized array, you can try it in your php or for this example here: http://blog.tanist.co.uk/files/unserialize/. The Code: a:1:{s:13:”administrator”;b:1;} Is: Array ( [administrator] => 1 ) Meaning the user is an administrator. You can add new roles to the database by running the function add_role, and only run it once!
The file wp-admin/includes/plugin.php is not always included. You may have to do this in your plugin. And your Location header is invalid: You have to send a complete URL. You should use: require_once( ABSPATH . ‘wp-admin/includes/plugin.php’ ); When do you call this function? Maybe too early.
the Best way to do this is have your X plugin made with its own hooks for actions and filters so new plugins (in your case Y) could interact with plugin X’s functions and data. Defining your own hooks is fairly easy and simple. Action Hook from the codex: Actions are the hooks that the … Read more