META Tags PHP Code

I always include the Facebook open graph META information at the top of ALL my pages, and on the new site I am building I am using aMember to control ALL the content, with the application installed in the root.

The FB open graph tags request titles, URLs and descriptions for each page to be placed in the header of each page. I've been able to easily put together something for the page title and the URL, but not the description. Can someone help me with the correct PHP code to print out just the description META tag that an admin would have filled in for that specific page? Here is what I have so far - and everything works EXCEPT the description code. Thanks in advance for ANY help!

Code:

<meta property="og:title" content="<?php p(isset($meta_title) ? $meta_title : $title) ?>" >
<meta property="og:site_name" content="SITE NAME">
<meta property="og:url" content="<?= "https://mysite.com".$_SERVER['REQUEST_URI']; ?>" >
<meta property="og:description" content="<?php p(isset($meta_description) ? $meta_description : $description) ?>" >

Thanks SO much Caeser, that definitely did the trick - I very much appreciate your help.

The Facebook Open Graph inclusions are something of a MUST for anyone building a modern website, and especially for anyone who is trying to use aMember as their main CMS for a small site like I am. With this trick, the only thing missing is the ability to assign an image to each of the individual pages in the same manner.

I would humbly request that the aMember team consider adding some type of support for open graph META tags within your systems. Obviously you would need to expand on this idea to make it useful for more than just Facebook, but all of the components are already there, you would just need to add an IMAGE option to the META table for each page (in addition to the title, keywords, and descriptions you already have in place) and then make an easy way to access it - or just add the IMAGE option and let customers access the code easily, like you just helped me with. Just an idea to make aMember even better!