[Explanation] How to get a Different Header for a special page

Hi,
I am making a subdomain and doing some linking and wanted to have one special page have a different header.
I don’t know much about php and google didnt help me. In the end i ended up creating some kind of code.

I’ll show you how to do this with the defualt wp skin(header.php skin file):

<div id="header" onclick="location.href='https://yourdomain.com/';" style="cursor: pointer;">
	<div id="headerimg">
		<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
		<div class="description"><?php bloginfo('description'); ?></div>
	</div>
</div>

Now just change it to this this code:

<?php if ( $paged('113')) { ?> <!--Here you can add the page number (find it in the URL or while editingin the URL)-->
<div id="header" onclick="location.href='https://fuerfrei.de/';" style="cursor: pointer;">
	<div id="headerimg">
		<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
		<div class="description"><?php bloginfo('description'); ?></div>
	</div>
</div>

<?php } elseif ( $paged('46')) { ?> <!--Use the elseif code once or multiple types if u want more than one page with a custom header-->
<div id="header" onclick="location.href='https://fuerfrei.de/';" style="cursor: pointer;">
	<div id="headerimg">
		<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
		<div class="description"><?php bloginfo('description'); ?></div>
	</div>
</div>

<?php } else { ?> <!--This Header will be shown everywhere, where you haven't defined a custom one -->
<div id="header" onclick="location.href='https://fuerfrei.de/';" style="cursor: pointer;">
	<div id="headerimg">
		<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
		<div class="description"><?php bloginfo('description'); ?></div>
	</div>

</div>
<?php } ?>

Now i think this should get you to have your own header on the page you defined with if or elseif.
As i searched for quite a while i hope this helps other People looking for the same thing a small idea on how to do it.
Please correct me if this is a bad way to do it, but it seems to work and seems easy for me(as i dont really know php very well).