Easy Extensible Plugins

Extensible plugins are often the ones the WordPress community consider to be the best as they take advantage of the WordPress license and allow developers to build on and edit them.

In this talk I will outline some of the methods which can be used to make your plugins extensible, allowing others to edit and build upon them.

Transcript

1. EASY EXTENSIBLE PLUGINS Mark Wilkinson @wpmark markwilkinson.me
2. Secondary School Computing Teacher
3. Freelance Developer working from home
5. 31,491 PLUGINS *as of 05/06/2014
6. WHAT? WHY? TOOLS/FUNCTIONS EXAMPLES
7. PLUGIN and or THEME
8. One that can be modified or extended without changing the plugin code itself AN EXTENSIBLE PLUGIN is
9. WHY?
10. SAFE MODIFICATION FUNCTIONALITY
11. SAFE MODIFICATION FRONT END OUTPUT
12. https://www.flickr.com/photos/damndirty/10166197684
14. TOOLS FUNCTIONS
15. ACTIONS & FILTERS
16. do_action();
18. 'do_action( 'twentyfourteen_credits’ );
19. function wpmark_notice() { echo '<p>Site by Mark Wilkinson</p>'; } add_action( 'twentyfourteen_credits', 'wpmark_notice' );  
20. apply_filters();
21. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus malesuada sem at sapien rutrum, eu…   Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus malesuada sem at sapien rutrum, eu…  
22. '<div class="latest-tweets">'. apply_filters( 'latest_tweets_render_before', '' ). $list. apply_filters( 'latest_tweets_render_after', '' ). '</div>';  
23. function wpmark_twitter( $content ) { /* get the twitter url from site options */ $url = get_option( ‘twitter_url' ); $content = '<a href="' . esc_url( $url ) . '">@' . basename( $url ) . '</a>'; return $content; } add_filter( 'latest_tweets_render_before', ’wpmark_twitter' );  
24. IMPEMENTATION INTO YOUR OWN PLUGINS
25. SETTING UP ARRAYS BEFORE/AFTER HTML OUTPUT BEFORE/AFTER SETUP
26. $query_args = array( 'post_type' => 'page', 'cat' => 1 );
27. $query_args = apply_filters( 'wpmark_query_args', array( 'post_type' => 'page', 'cat' => 1 ) );
28. $query = new WP_Query( $query_args ); while( $query->have_posts() ) : $query->the_post(); ?> <!-- // post output here --> <?php endwhile;
29. $query = new WP_Query( $query_args ); while( $query->have_posts() ) : $query->the_post(); do_action( ‘wpmark_before_post’, get_the_ID() ); ?> <!-- // post output here --> <?php endwhile;
30. $query = new WP_Query( $query_args ); while( $query->have_posts() ) : $query->the_post(); do_action( ‘wpmark_before_post’, get_the_ID() ); ?> <!-- // post output here --> <?php do_action( ‘wpmark_after_post’, get_the_ID() ); endwhile;
31. EXAMPLES
33. apply_filters( ‘gform_field_value_date’ );
34. function populate_date( $value ) { return "10/10/2010"; } add_filter( ‘gform_field_value_date’, ‘populate_date’ );
36. function wpmark_product_wrapper() { echo '<div class="products-wrapper">Something before the loop.</div>'; } add_action( 'woocommerce_before_shop_loop', 'wpmark_product_wrapper’ );
37. CONCLUSION
38. do_action(); apply_filters() OUR FRIENDS
39. THANK YOU Mark Wilkinson @wpmark markwilkinson.me
40. QUESTIONS