plugin-development - Read For Learn

Is there a hook for when you switch themes?

There is a ‘switch_theme’ action that runs right after the theme is switched. function my_on_switch_theme($new_theme) { $current_themes = wp_get_themes(); /* Fixed deprecated function */ $new_theme_info = $current_themes[$new_theme]; /* $new_theme_info should now be an associative array with the following: $new_theme_info[‘Title’]; $new_theme_info[‘Version’]; $new_theme_info[‘Parent Theme’]; $new_theme_info[‘Template Dir’]; $new_theme_info[‘Stylesheet Dir’]; $new_theme_info[‘Template’]; $new_theme_info[‘Stylesheet’]; $new_theme_info[‘Screenshot’]; $new_theme_info[‘Description’]; $new_theme_info[‘Author’]; $new_theme_info[‘Tags’]; $new_theme_info[‘Theme Root’]; $new_theme_info[‘Theme … Read more

How to implement bulk actions in my plugin?

Unfortunately there isn’t a way of doing this yet, see this trac report. While it would have been possible to add actions to the bulk-actions drop-down menu, there doesn’t exist (yet) a way of handling custom actions. It seems that WordPress deliberately prevents you from adding custom actions (presumably until it’s decided how bulk actions … Read more

Is There A Hook To Process The Content Of The Text Widget?

Filter widget_text (for the text) widget_title (for the title) Example function add_smiley($content) { $new_content=””; $new_content.= $content . ‘:)’; return $new_content; } add_filter(‘widget_text’, ‘add_smiley’); Note that this works only for the content so not if you have a widget with only a title. Reference http://codex.wordpress.org/WordPress_Widgets https://stackoverflow.com/questions/1385954/do-wordpress-widget-or-sidebar-hooks-exist https://stackoverflow.com/search?q=wordpress+widget

Check for success of $wpdb->update() correctly

The correct way is with === FALSE which differentiates from equalling zero, which is what a succesful query with no results returns. if( $wpdb->update($tableName,array(‘opt_value’=>$cInfo),array(‘opt_name’=>’showWeatherWidget’)) === FALSE) //show failure message else // show success message

Using filters and actions for plugin API?

Surely this approach has some benefits, but has also some issues. It’s not really easy to use If the target of your plugin are WordPress developers, they will be very familiar with plugin API, but end users are not. For a non-developer, something like: $data = give_me_the_data(); It’s easier to understand, remember and type than: … Read more

Email verification for new users

I had a very similar problem which I solved the other day. In my case I wanted to allow users to choose their own password, and then activate their account via email. There’s alot to this, so I’ll just outline how to I achieved the e-mail verification. First, I used user_register (runs when a user … Read more

Test to see if jQuery or Prototype is queued by another plugin?

Use wp_script_is() to check if a script is in the queue. function add_my_scripts() { $doing_jquery = wp_script_is(‘jquery’, ‘queue’); $doing_prototype = wp_script_is(‘prototype’, ‘queue’); var_dump($doing_jquery, $doing_prototype); } add_action(‘wp_print_scripts’, ‘add_my_scripts’);

Calling the widget id of a mult-instance widget from inside the widget?

You can get the instance ID with echo $this->id; ($this is the class instance) The only time you can’t get this id is from the form() function, right after you just dropped the widget (here‘s the reason why)

How to make method from plugin available in theme?

An alternative way is to use static class methods in plugins, and optionally write functions as alias: in Plugin: class Pluginslug_Foo { static $foo = ‘Bar!’; public static function bar() { return self::$foo; } } if ( ! function_exists( ‘pluginslug_bar’ ) ) { function pluginslug_bar() { echo Pluginslug_Foo::bar(); } } in Theme: if ( function_exists( … Read more

Replace audio/video enclosure with player?

I believe part of what you’re looking for is the WP_Embed class defined in wp-includes/media.php. It implements a framework for automatically replacing urls with the output of embed handlers. I’m afraid you’ll have to do the deeper research yourself (this was apparently introduces in 2.9.0, so documentation might still be thin). I doubt WordPress core … Read more

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