PHP wordpress if a text value is empty, echo

Question

I'm building a wordpress theme. In the backend, the user has the option to enter the url for their social networks (i.e. twitter, facebook, instagram etc). These URL's are then dynamically added to images in the theme front end linking to the respective networks.

The issue I have is that if a user doesn't enter a url for a network, I don't want the image to display. I am trying to write code that says, if the url is blank, echo 'class="hidden"' - this class has display:none in the css.

here is a snippet of my php:

<ul class="icons">
    <li <?php if (get_theme_mod('footer_twitter')==0) {echo 'class="hidden"'; } ?>><a href="<?php echo get_theme_mod('footer_twitter'); ?> " class="icon circle fa-twitter"><span class="label">Twitter</span></a></li>
</ul>

and the css:

ul.icons li.hidden {
   display:none;
}

The php code above currently outputs the echo statement for all cases, even when a url is entered in the backend. Can anyone help me with this code

echo (empty(get_theme_mod('footer_twitter'))) ? 'class="hidden" : ''; possibly? — Darren
– Darren, Commented Jun 22, 2014 at 0:29
Afraid not. got the following fatal error: Can't use function return value in write context — Sam Skirrow
– Sam Skirrow, Commented Jun 22, 2014 at 0:34

lin · Accepted Answer · 2014-06-22 15:02:12Z

2

Check the return of "get_theme_mod()" You can check this by using, cause i dont think it "== 0". http://codex.wordpress.org/Function_Reference/get_theme_mod

var_dump(get_theme_mod('footer_twitter'));
//string(0)

Here is your new code:

<ul class="icons">
    <li class="<?php echo empty(get_theme_mod('footer_twitter')) ? 'hidden' : ''; ?>">
        <a href="<?php echo get_theme_mod('footer_twitter'); ?> " class="icon circle fa-twitter">
            <span class="label">Twitter</span>
        </a>
    </li>
</ul>

Please check this Syntax: http://php.net/manual/en/control-structures.alternative-syntax.php its the best way to code control structures in your "View" code.

edited Jun 22, 2014 at 15:02

answered Jun 22, 2014 at 0:32

lin

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8 Comments

Sam Skirrow Over a year ago

So for this to work, do I need to add the var_dump line to the top of my code?

lin Over a year ago

No, var_dump just shows you the explicit return of your function "get_theme_mod()". Ensure its int(0) and not something else. Look at " get_theme_mod('footer_twitter') === 0"

lin Over a year ago

Keep in mind "get_theme_mod('footer_twitter') === 0" is not the same like "get_theme_mod('footer_twitter') == 0". So, in second case, if "get_theme_mod('footer_twitter')" return bool(false) instead of int(0) your condition is "true". cause -> "if (false == 0) { //true }" ;)

Sam Skirrow Over a year ago

This is great, although it appears that it is not adding the class to any. Could it be because the value is a URL not an integer?

lin Over a year ago

Mhmm, can you post the result of var_dump(get_theme_mod('footer_twitter')); ? Please post both, means true/false return.

|

Dan · Accepted Answer · 2021-09-10 00:08:52Z

0

<?php if (!empty (get_theme_mod( 'set_address2' ))) {
    echo get_theme_mod( 'set_address2');
}?>

This seemed to work for me in Wordpress. Let me know if this works.

answered Sep 10, 2021 at 0:08

Dan

16

1 Comment

Dan Over a year ago

I just saw how long ago this question was asked. I hope I'm not too late.

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