PHP in variable?

Hi there – i have a question about php.

I use “smooth slider” old version and I’d like to have something that calls a custom field.

I’ve found the code where I’d love to let the custom field show up. But after hours, I don’t get it to work. I think it’s just an easy noob mistake:

Here is the code:

$html .=  sslider_get_the_image($img_args);

		if(!$smooth_slider['content_limit'] or $smooth_slider['content_limit'] == '' or $smooth_slider['content_limit'] == ' ')
		  $slider_excerpt = substr($slider_content,0,$smooth_slider['content_chars']);
		else
		  $slider_excerpt = smooth_slider_word_limiter( $slider_content, $limit = $smooth_slider['content_limit'] );

		if ($smooth_slider['image_only'] == '1') {
			$html .= '<!-- /smooth_slideri -->
			</div>';
		}
		else {
		   if($permalink!='') {
			$html .= '<h2 ><a href="'.$permalink.'">'.$post_title.'</a></h2><span> '.$slider_excerpt.'</span>
				<p class="more"><a href="'.$permalink.'">'.$smooth_slider['more'].'</a></p>

				<!-- /smooth_slideri -->
			</div>'[....]

I tried to make something like $mymeta = get_post_meta($post->ID, "mycustomfield", true); and I wanted to have it in the Title:

`.$post_title.'</a></h2><span>’

So I wrote it like this:
.$post_title.'</a></h2>'.$mymeta.'<span>' but it doesn’t work. I can’t see anything on the frontend.

So my question: how can I put “php” into this code to show my custom field value right next to the Title??

Thank you!!!

AD