How do I do If Post Meta DOES NOT exist? [closed]

Question

I have the following code:

<?php $buycheck = get_post_meta($post->ID, 'buy-link', true); ?>

                <?php if ( $buycheck ) : ?>
                    <div class="section-title sidebar span5">
                        <h5>Get This Release</h5>
                    </div>

                <?php else : ?>

                    <div class="section-title sidebar span5">
                        <h5>More Releases</h5>
                    </div>

                <?php endif; ?>

Later in my code I want to be able to say that if buy-link does not exist - i.e. there is no data in that field - then do something, else do something different.

Not sure how to do this!

Answer 1

I have used this:

    if (!$buycheck) {
        do something if $buycheck does not exist;
    } else {
        do something if $buycheck exists;
    }