- 1). Open your theme's "functions.php" file in a HTML or text editor. Scroll down to the very bottom and create a blank line by placing your cursor just above the "?>" at the end of the document, then hitting enter.
- 2). Create your widget's custom class. This class works with the WordPress widget API to give your widget its basic functionality, so you don't have to recreate the entire widget code. To create an image slideshow, you would enter:
class my_slideshow extends WP_Widget {
Where "my_slideshow" is the name of your widget's custom function callback. - 3). Hit enter to move to a new line and add your widget's "function callback." You can name the function anything you want since underscores are used in place of spaces, but it must be the same callback designated in your "class" line. For example:
function my_slideshow () {
parent::WP_Widget(false, 'My Slideshow');
Replace "My Slideshow" with the widget title you wish to appear in the WordPress Widget Administration page. - 4). Move to a new line and enter a "}" to close the first set of code. If you forget to add these brackets or miss a comma or semicolon, your code will not render properly and the page will produce a PHP error. Reference the PHP manual or WordPress Codex for specific tag syntax if you are ever unsure of how to format a particular line of code.
- 5). Hit enter to move to the next line. Enter your "register_widget" function using the following format:
register_widget('my_slideshow');
You would replace "my _slideshow" with the unique function callback for your widget. You would follow this with the code pertaining to your widget's options, settings and display. For example:
function form($instance) {
// Enter the form options parameters or array here
}
function update($new_instance, $old_instance) {
// processes widget options to be saved
return $new_instance;
}
function widget($args, $instance) {
// Enter the code for displaying the widget here.
}
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