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I'm using: get_theme_mod to show various pieces of info from the theme customizer, in the following format:

<a href=" <?php get_theme_mod( $name, $default ) ?> ">This is the link</a>

I would like to hide the whole line if that particular customizer field is empty.

What could I wrap around the anchor to accomplish this?

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$value = get_theme_mod( $name, $default );
if ($value !== $default) { 
   <a href=" <?php echo $value; ?> ">This is the link</a>
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Awesome, thanks Otto! Funny you answered, as it's from your customizer tutorial I'm following. Where abouts would I place this code? In functions.php? – user2014024 Feb 25 '13 at 23:37
Wherever the code you had above is, most likely your template. – Wyck Feb 26 '13 at 3:13

Looking for an answer to displaying default text in place of a customizer set heading. In a funny roundabout way, thepost by @Otto gave me the idea of checking for an empty string.

<?php if( get_theme_mod( 'tcx_portfolio_intro') == '' ) : ?>
<div class="intro">
<h2><?php echo ('nothing here yet'); ?></h2>
<?php endif; ?>
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