I am able to apply the following urlencode to static text, with the following code...

<?php echo(urlencode('Any Text Here')); ?>

I am also able to display the Extra Field, with the following code...

<?php echo $this->item->extraFields->AliasHere->value; ?>


How do I combine the two, to dynamically apply the urlencode to the Extra Field that I want displayed?

Hi. You can't do this easily. The value holds also the a tag so you need to process it first with a regular expression. The question here is: why you need to do this?

I need it to pass extra field values to non-javascript social media share links:

danielmiessler.com/blog/social-media-buttons-no-javascript/

Wouldn't you need the Absolute URL of the item instead?
$this->item->absoluteURL

Now if you want to combine a text field you can do the following: