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Plugin Description
This plugin provides an [if] shortcode to conditionally render content. The syntax is the following:
[if condition1 condition2=false condition3]{content}[/if]
Conditions are passed as attribute names. Multiple conditions evaluate to the result of ORing all of them. In other words, if at least one condition evaluates to the desired boolean result, {content} is rendered, otherwise it is discarded.
Attribute values determine if we want the condition to be true or false. A value of '0', 'false', '' (the empty string), 'null' or 'no' means we expect the condition to be false. Anything else, including the absense of a value, is interpreted as true.
For example, suppose that we want to include a sentence in a post, but only for anonymous visitors:
[if is_user_logged_in=no]The Sentence.[/if]
It also provides an [else] shortcode and an [eitherway] one for use inside [if] blocks. [else] will render its content if the condition evaluates to false, and [eitherway] will render its content regardless of the evaluation result.
When used outside an [if] block, these shortcodes behave as if the whole content is surrounded by an [if] shortcode whose condition evaluates to true. In other words, an [else] shortcode would not render any content, while a [eitherway] one would. You can use as many of these shortcodes as you like in a single [if] block, which gives you the ability to do things like:
- Am I logged in?
[if is_user_logged_in]- Yes you are.
[else]- No you are not.
[/else][eitherway]- I'm sorry, what?
[/eitherway]- I said YOU A-R-E LOGGED IN!!!
[else]- YOU ARE NOT LOGGED IN!!! What's the matter with you?[/else][/if]
A multitude of conditions are supported out-of-the-box. The following evaluate to the result of the corresponding WordPress Conditional Tag, using the no-parameter syntax:
is_single
is_singular
is_page
is_home
is_front_page
is_privacy_policy
is_attachment
is_category
is_tag
is_tax
is_author
is_archive
is_year
is_month
is_date
is_day
is_time
is_feed
is_search
is_sticky
is_preview
has_term
has_excerpt
comments_open
pings_open
is_404
is_user_logged_in
is_super_admin
is_multi_author
is_multisite
is_main_site
is_child_theme
For example, the evaluation of the is_page condition is equivalent to calling is_page() with no parameter.
Extending
The functionality of the plugin can be extended by other plugins, by means of adding custom conditions through filters. To add a custom condition, a filter hook must be defined in the following manner:
add_filter($if_shortcode_filter_prefix.'my_condition','my_condition_evaluator');
function my_condition_evaluator($value) {
$evaluate=.... /* add your evaluation code here */
return $evaluate;
}
Then, you can use your custom condition like so:
[if my_condition]{content}[/if]
A big thanks to M Miller for the normalize_empty_atts() function.
Screenshots
No screenshots provided
