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.

TomHarrigan

jrrl

<p>This plugin gives content developers shortcode equivalents to the conditional tags that WordPress provides for theme developments.  Each shortcode only includes its contents if a certain condition is true.  This allows them to modify what content is shown in any given context on a post-by-post basis. is_page, is_single and is_category allow specific pages, posts, categories to be specified by using the “ids” parameter.</p>
<p>The shortcodes and when they include contents are:</p>
<ul>
<li>is_single – if showing a single post. Use the optional parameter “ids” to specify specific posts.</li>
<li>is_singular – if showing a single post or page.</li>
<li>is_page – if showing a page. Use the optional parameter “ids” to specify specific pages.</li>
<li>is_home – if showing the blog home.</li>
<li>is_front_page – if showing the front page of the site.</li>
<li>is_sticky – if the current post or page is ‘sticky’.</li>
<li>is_category – if showing a category-based archive. Use the optional parameter “ids” to specify specific categories.</li>
<li>is_page – if showing a page.</li>
<li>is_tag – if showing a tag-based archive.</li>
<li>is_tax – if showing a tag- or category-based archive.</li>
<li>is_author – if showing an author-based archive.</li>
<li>is_archive – if showing any archive.</li>
<li>is_year – if showing a yearly archive.</li>
<li>is_month – if showing a monthly archive.</li>
<li>is_day – if showing a daily archive.</li>
<li>is_time – if showing an hourly or shorter archive.</li>
<li>is_feed – if generating a feed.</li>
<li>is_search – if showing search results.</li>
<li>comments_open – if comments are open for the current post or page.</li>
</ul>
<p>Each shortcode also has an “else” shortcode that can go inside it.  For example:</p>
<pre><code>[is_single]
This is only shown if showing just this post.
[not_single]
This is shown everywhere else.
[/is_single]
</code></pre>
<p>The is_page, is_category and is_single shortcodes allow you to specify pages, categories, posts on which to show the content if you’d like to only show content within the shortcode on specific pages, posts or categories.</p>
<pre><code>[is_page ids="76, 339"]hello[/is_page]

[is_category ids="5, 7"]hello[/is_page]

[is_single ids="94, 63"]hello[/is_single]
</code></pre>
<p>In general, the “else” shortcode is just replacing “is” with “not”.  The one exception is “not_comments_open” as the “else” shortcode for “comments_open”.</p>
<p>Whichever chunk of content is included is processed for shortcodes, so you can use all your other shortcodes and even nest these if you need to.</p>
<h3>Further Instructions</h3>
<p>Any other information I have can be found at the <a href="http://thomasharrigan.com/wordpress-conditional-shortcodes/" rel="nofollow ugc">WP Conditional Shortcodes Homepage</a>.</p>


Script Logic vs WP Conditional Shortcodes