shazdeh

<p>With this shortcode you can take control of where the content is displayed.</p>
<h4>Usage</h4>
<p>You can use all the <a href="https://codex.wordpress.org/Conditional_Tags" rel="nofollow ugc">conditional tags</a> WordPress provides. Checkout examples below.</p>
<p>Show text only on the homepage:<br />
    [if is_front_page] The text [/if]</p>
<p>Show text only on the About page of the site:<br />
    [if is_page=”about”] The text [/if]</p>
<p>Show only on the category archive view:<br />
    [if is_category] The text [/if]</p>
<p>You can add “not_” before the conditional tag to reverse the logic, example:<br />
Show on all pages of the site except the homepage:<br />
    [if not_is_front_page] The text [/if]</p>
<h4>OR</h4>
<p>Using multiple parameters, the content is displayed when either of the conditions are met (“OR” comparison), for example, show text on both category and tag archive pages:<br />
    [if is_category is_tag] The text [/if]</p>
<h4>AND</h4>
<p>To set multiple conditions you can nest the shortcode, for example show text only on homepage AND if the user is logged in:<br />
    [if is_user_logged_in][if is_front_page] The text [/if][/if]</p>
<p>Show a link to wordpress.org site, only on single post pages and only on mobile devices:<br />
    [if wp_is_mobile][if is_single] <a href="https://wordpress.org/" rel="ugc">WordPress</a> [/if][/if]</p>
<h4>has_term_{taxonomy}</h4>
<p>You can use this to check if the current post in the loops belongs to a custom term in the desired taxonomy. See: https://codex.wordpress.org/Function_Reference/has_term</p>
<p>Example, check if current post has the “jazz” term in the “genre” taxonomy:<br />
    [if has_term_genre=”jazz”] The text [/if]</p>


Conditional Tags Shortcode

A shortcode to display content based on context.

Tahir Yasin

<p>This plugin lists all JavaScripts and Style sheets with a control field that lets you control CSS & JavaScript files to include only on the pages where you actually need them. The text field lets you use WP’s <a href="https://codex.wordpress.org/Conditional_Tags" rel="nofollow ugc">Conditional Tags</a>, or any general PHP code.</p>
<p>NOTE: The script logic you introduce is evaluated directly. Anyone who has permission to manage options will have the right to add any code, including malicious and possibly destructive code. There is an optional filter ‘script_logic_eval_override’ which you can use to bypass the EVAL with your own code if needed. (See <a href="other_notes/" rel="nofollow ugc">Other Notes</a>).</p>
<h3>Writing Logic Code</h3>
<p>The text in the ‘Logic’ field can be full PHP code and should return ‘true’ when you need the script to load. If there is no ‘return’ in the text, an implicit ‘return’ is added to the start and a ‘;’ is added on the end. (This is just to make single statements like is_home() more convenient.)</p>
<h4>The Basics</h4>
<p>Make good use of <a href="https://codex.wordpress.org/Conditional_Tags" rel="nofollow ugc">WP’s own conditional tags</a>. You can vary and combine code using:</p>
<ul>
<li><code>!</code> (NOT) to <strong>reverse</strong> the logic, eg <code>!is_home()</code> is TRUE when this is NOT the home page.</li>
<li><code>||</code> (OR) to <strong>combine</strong> conditions. <code>X OR Y</code> is TRUE when either X is true or Y is true.</li>
<li><code>&&</code> (AND) to make conditions <strong>more specific</strong>. <code>X AND Y</code> is TRUE when both X is true and Y is true.</li>
</ul>
<p>There are lots of great code examples on the WP forums, and on WP sites across the net. But the WP Codex is also full of good examples to adapt, such as <a href="https://codex.wordpress.org/Template_Tags/in_category#Testing_if_a_post_is_in_a_descendant_category" rel="nofollow ugc">Test if post is in a descendent category</a>.</p>
<h4>Examples</h4>
<ul>
<li><code>is_home()</code> — just the main blog page</li>
<li><code>!is_page('about')</code> — everywhere EXCEPT this specific WP ‘page’</li>
<li><code>!is_user_logged_in()</code> — shown when a user is not logged in</li>
<li><code>is_category(array(5,9,10,11))</code> — category page of one of the given category IDs</li>
<li><code>is_single() && in_category('baked-goods')</code> — single post that’s in the category with this slug</li>
<li><code>strpos($_SERVER['HTTP_REFERER'], "google.com")!=false</code> — script to load when clicked through from a google search</li>
<li><code>is_category() && in_array($cat, get_term_children( 5, 'category'))</code> — category page that’s a descendent of category 5</li>
<li><code>global $post; return (in_array(77,get_post_ancestors($post)));</code> — WP page that is a child of page 77</li>
<li><code>global $post; return (is_page('home') || ($post->post_parent=="13"));</code> — home page OR the page that’s a child of page 13</li>
</ul>
<p>Note the extra ‘;’ on the end where there is an explicit ‘return’.</p>
<h3>The ‘script_logic_eval_override’ filter</h3>
<p>Before the Script Logic code is evaluated for each script, the text of the Script Logic code is passed through this filter. If the filter returns a BOOLEAN result, this is used instead to determine if the script should load. Return TRUE to load.</p>


Script Logic

Script Logic lets you control on which pages scripts and style sheets load using WP's conditional tags.

Conditional Tags Shortcode vs Script Logic