How to say “if category exists..

<?php if( is_category('3, 14, 55, 11') ) echo 'Hello';
elseif( is_category('1, 10, 22') ) echo 'Goodbye';?>

thank’you very much esmi !! :)))

..may I ask another thing ?

I must write this:

<?php if( is_category(‘4’) ) echo ”;?>

but the category must be this:
category-<?php echo get_post_meta($post->ID, “whatiwant”, true); ?>

and the echo must be this:

<?php echo get_post_meta($post->ID, “whatiwant”, true); ?>/”>
how can I write this in php..??

sorry again..!

ops.. I have write wrong href..

and the echo must be this:

<li><a href=" <?php echo get_option("home"); ?>/<?php echo get_post_meta($post->ID, "whatiwant", true); ?>/">example</a></li>

Sorry? What is it that you’re actually trying to do?

well, I have a custom field with a specific value (es. xxxxx)

this specific value is a part of a category name (es. category-xxxxx)

I wish that:

if category-xxxxx exists, display a link of this kind
<a href="www.site.com/category-xxxxx/>category of xxxxx</a>
else do nothing

thanks a lot esmi

The code I gave above isn’t going to work then. It tests to see if you’re in a particular category – not whether that category exists.

See if this works:

<?php
$cat_name = 'category-' . get_post_meta($post->ID, "whatiwant", true);
if( get_cat_ID( $cat_name ) ) :?>
<li><a href="<?php bloginfo('url'); echo $cat_name; ?>/">example</a></li>
<?php endif;?>

thanks 4 reply but not works.. ??

I have resolve half problem with:
<?php if( is_category('categoria-' . get_post_meta($post->ID, "whatiwant", true)) ) echo '';

but the problem, now, is echo ..

I cannot display the correct url made of a static url + a query string.

es.
<li><a href="https://www.mydomain.com/categoria-<?php echo get_post_meta($post->ID, "whatiwant", true); ?>/">example</a></li>

how is the correct sintax?

Thank’you very much, I really appreciate your efforts to help me!

Not sure if I completely understood your need, but if you want to place the code on the category.php and test: “if it is a certain category show this link, else shows nothing” then this code may work for you.

<?php if (is_category('id or name here')) { ?>
    Category of <?php the_category(' '); ?>
    <?php } else { ?>
    <?php } ?>

No need to add link tag to the <?php the_category(‘ ‘); ?> as it will generate by itself.

Or maybe for the custom field:

<?php if (is_category(id or name here)) { ?>
<?php if( get_post_meta($post->ID, "whatiwant", true) ): ?>
<?php echo get_post_meta($post->ID, "whatiwant", $single = true); ?>
<?php endif; ?>
<?php } else { ?>
<?php } ?>

uhm.. sorry but the problem is more difficult.

I have tryed this line:
<?php if( is_category('photographs-' . get_post_meta($post->ID, "artist", true)) ) echo '<li><a href="' . get_option('home') . '/">photographs</a></li>';
..and it works fine!

but the echo link must be different that home url
I would display this:

https://www.domain.com/artist/photographs-of-<?php echo get_post_meta($post->ID, "artist", true); ?>/

how I code php?

I have resolved!

if( is_category('photographs-' . get_post_meta($post->ID, "artist", true)) ) echo('<li><a href="https://www.domain.com/artists/photographs-'.get_post_meta($post->ID,'artists',true).'">'.'
photographs'.'</a></li>');

but It works only on archives page.. but not in a simple page..

anyone knows why?

For regular pages, try if in_category.

if( in_category('photographs-' . get_post_meta($post->ID, "artist", true)) ) echo('<li><a href="https://www.domain.com/artists/photographs-'.get_post_meta($post->ID,'artists',true).'">'.'
photographs'.'</a></li>');

You probably just need to include it to the page.php – you were only referring to archive.php…