In URL extension action PHP if condition use

In this tune I am going to discuss about how to use php if condition in url extension. One of my client use “wordpress-wiki-plugin” in a website. If you are use the plugin every single post show two additional menu like tab menu name “Discussion” and “History”. Client want to remove some section when in Discussion and History tab.

I am trying to do this by using jquery but not successful. There was a URL extension changes when click on Discussion url show post_url/?action=discussion  and when in history tab it is show post_url/?action=history.

I got a solution from forum question see wordpress.stackexchange

Used code:

<?php if( $_GET['action'] == 'discussion' ) { ?>
It's True.
<?php } else { ?>
It's False.
<?php } ?>

or

<div class="container">
<div class="line number1 index0 alt2"><code class="php plain"><?php </code><code class="php keyword">if</code><code class="php plain">( </code><code class="php variable">$_GET</code><code class="php plain">[</code><code class="php string">'action'</code><code class="php plain">] == </code><code class="php string">'discussion'</code> <code class="php plain">) { ?></code></div>
<div class="line number2 index1 alt1"><code class="php spaces">    </code><code class="php plain">It's True. Here write the CSS
</code></div>
<div class="line number3 index2 alt2"><code class="php plain"><?php } ?></code></div>
</div>

Use the condition in single single.php file.