WordPress.org

Ready to get started?Download WordPress

Forums

shortcode_atts defaults are not working (5 posts)

  1. moikirsch
    Member
    Posted 2 years ago #

    I have this code in a shortcode that I'm creating:

    extract( shortcode_atts( array(
    		'id' => '',
    		'size' => '1/2',
    		'group' => '',
    	), $atts ) );

    Everything seems to work fine but for some reason the shortcode_atts function is not setting up the defaults.

    So when I try something like:
    $size = $atts['size'];

    I get a PHP notice Notice: Undefined index: size in...

    I'm using the shortcode like this: [media id=81]

    Any ideas? (or known bugs?)

    I'm working on the latest version (3.3.1)

    I

  2. Big Bagel
    Member
    Posted 2 years ago #

    shortcode_atts() combines any user provided parameters ($atts) with the array of defaults you provide and returns the merged array.

    Function Reference/shortcode atts

    In your example above $atts['size'] doesn't exist and thus results in an undefined index notice. You want to either store the returned array in a variable or (like you are currently doing) use PHP's extract function to create individual variables from each element in the array. After using extract(), $size, $id, and $group exist and are already set to the proper values.

    Edit:
    Just a minor side note, there's an errant comma in your code. Should be:

    'group' => ''

  3. moikirsch
    Member
    Posted 2 years ago #

    Hi Big Bagel,

    There shouldn't be a notice since I'm setting up the default value for size to be '1/2' even if the user doesn't call it.

    Actually I think that the problem was related to the extract function.

    I was able to fix it using the following line instead:

    $atts = shortcode_atts( array( 'id' => '', 'size' => '1/2', 'group' => '', 'showtitle' => true, 'showicon' => true, 'showbody' => true, 'icon' => ''), $atts );

  4. Big Bagel
    Member
    Posted 2 years ago #

    Yes, there should be a notice. $atts is whatever parameters the user provides. When this shortcode is used, only $atts['id'] exists:

    [media id=81]

    The function shotcode_atts() then takes that array and merges it with the defaults you provide, returning the result. If you used:

    $merged = shortcode_atts( array( 'id' => '', 'size' => '1/2', 'group' => '', 'showtitle' => true, 'showicon' => true, 'showbody' => true, 'icon' => ''), $atts );

    Then $merged would be an array of all the proper values and $atts would still only be an array of whatever the user provided. Your new code in effect merges the given and default parameters then overwrites the $atts array with the new array. Using extract(), like you did before, automatically creates a variable that can be immediately used for each key in the returned array ($id, $size, $group, etc.).

    Some good shortcode references:

    Shortcode API
    http://planetozh.com/blog/2008/03/wordpress-25-shortcodes-api-overview/
    http://aaron.jorb.in/blog/2010/02/wordpress-shortcodes-a-how-to-by-example/#.TwyTGG9SQsI
    http://wp.smashingmagazine.com/2009/02/02/mastering-wordpress-shortcodes/
    http://wp.tutsplus.com/tutorials/getting-started-with-wordpress-shortcodes/

  5. Shaun Scovil
    Member
    Posted 2 years ago #

    Thanks for posting your solution, @moikirsch!

    I had the same problem, where the extract function (which appears in the Codex example) seems to serve no purpose.

Topic Closed

This topic has been closed to new replies.

About this Topic