if get_post_meta is empty do something

4 comments

1. You could use the empty function inside your if as such :

   <?php if( empty( get_post_meta( $post->ID, 'price_list_category1', true ) ) ) : ?>style="display:none;"<?php endif; ?>
   

   The above returns an error, you should assign the return value to a variable. See my edit below.

   Warning

   empty might not be the best option depending on the values you store in the meta. Values like false, 0 etc… will be considered empty.

   Check the PHP manual for the full list of values that are considered empty.

   Edit

   You can try assigning the meta to a variable, and using that in the if statement.

    <?php
         $price_list = get_post_meta( $post->ID, 'price_list_category1', true );
    ?>
   

   And then…

    if( empty( $price_list) ) : ?>style="display:none"<?php endif; ?>
   

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2. You can use metadata_exists(); (worked for me)for checking for any post meta and the do whatever you want.

       // Check and get a post meta
   
   if ( metadata_exists( 'post', $post_id, '_meta_key' ) ) {
       $meta_value = get_post_meta( $post_id, '_meta_key', true );
   }
   

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3. I found this via searching for a solution myself, but it dawned on me the answer is very simple. You simply need to check if the value is empty, if it is then echo nothing – if it has content, then display the content – the code i used is below and can be tailored accordingly to anyone who needs to use it.

   <?php $meta = get_post_meta( get_the_ID(), 'page-sub-title', true );
       if ($meta == '') {
           echo '&nbsp;';
       } else {
           echo '<h2>' . $meta . '</h2>';
         }
   ?>
   

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4. if( ! in_array( 'given_key', get_post_custom_keys($post_id) ) ) {}
   

   Here it is written: https://developer.wordpress.org/reference/functions/get_post_meta/#user-contributed-notes

   get_post_custom_keys Returns an array containing the keys of all custom fields of a particular post or page. For me, this is the best solution 🙂

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