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
   

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2. Secondary School
   Computing Teacher
   

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3. Freelance Developer
   working from home
   

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5. 31,491 PLUGINS
   *as of 05/06/2014
   

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6. WHAT?
   WHY?
   TOOLS/FUNCTIONS
   EXAMPLES
   

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7. PLUGIN and or THEME
   

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8. One that can be modified or extended
   without changing the plugin code itself
   AN EXTENSIBLE
   PLUGIN
   is
   

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9. WHY?
   

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10. SAFE
    MODIFICATION
    FUNCTIONALITY
    

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11. SAFE
    MODIFICATION
    FRONT END OUTPUT
    

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12. https://www.flickr.com/photos/damndirty/10166197684
    

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14. TOOLS
    FUNCTIONS
    

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15. ACTIONS & FILTERS
    

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16. do_action();
    

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18. 'do_action(
    'twentyfourteen_credits’
    );
    

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19. function wpmark_notice() {
    echo 'Site by Mark Wilkinson';
    }
    add_action( 'twentyfourteen_credits', 'wpmark_notice' );  
    

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20. apply_filters();
    

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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…
     
    

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22. ''.
    apply_filters( 'latest_tweets_render_before', '' ).
    $list.
    apply_filters( 'latest_tweets_render_after', '' ).
    '';  
    

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23. function wpmark_twitter( $content ) {
    /* get the twitter url from site options */
    $url = get_option( ‘twitter_url' );
    $content = '@' .
    basename( $url ) . '';
    return $content;
    }
    add_filter( 'latest_tweets_render_before', ’wpmark_twitter' );  
    

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24. IMPEMENTATION
    INTO YOUR OWN PLUGINS
    

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25. SETTING UP ARRAYS
    BEFORE/AFTER HTML OUTPUT
    BEFORE/AFTER SETUP
    

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26. $query_args = array(
    'post_type' => 'page',
    'cat' => 1
    );
    

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27. $query_args = apply_filters(
    'wpmark_query_args',
    array(
    'post_type' => 'page',
    'cat' => 1
    )
    );
    

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28. $query = new WP_Query( $query_args );
    while( $query->have_posts() ) : $query->the_post();
    ?>
    
    endwhile;
    

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29. $query = new WP_Query( $query_args );
    while( $query->have_posts() ) : $query->the_post();
    do_action( ‘wpmark_before_post’, get_the_ID() );
    ?>
    
    endwhile;
    

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30. $query = new WP_Query( $query_args );
    while( $query->have_posts() ) : $query->the_post();
    do_action( ‘wpmark_before_post’, get_the_ID() );
    ?>
    
    do_action( ‘wpmark_after_post’, get_the_ID() );
    endwhile;
    

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31. EXAMPLES
    

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33. apply_filters(
    ‘gform_field_value_date’
    );
    

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34. function populate_date( $value ) {
    return "10/10/2010";
    }
    add_filter(
    ‘gform_field_value_date’,
    ‘populate_date’
    );
    

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36. function wpmark_product_wrapper() {
    echo 'Something before
    the loop.';
    }
    add_action(
    'woocommerce_before_shop_loop',
    'wpmark_product_wrapper’
    );
    

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37. CONCLUSION
    

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38. do_action();
    apply_filters()
    OUR FRIENDS
    

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39. THANK YOU
    Mark Wilkinson
    @wpmark
    markwilkinson.me
    

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40. QUESTIONS
    

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