How to check custom fields exists or not

Add a custom field

Now lets just add a custom fields value to our post. After checking the custom fields checkbox, scroll down to the page to see the Custom Fields box. Write your first custom fields name under the Name. It will be a kind of variable to call in our template file. After that write a value you want to display in your post. It should be done under the Value tab.

Get custom fields value to our post

To get the custom fields value we do not need to add any function into the function.php file. Its quite easy to get it by the simple wordperss function.
Just copy the below code into your theme or where you want to display the value.

echo get_post_meta($post->ID, 'Your Custom Fields Name', true);

Check if the custom fields exists or not

With the help of of some if else conditional statement we can check weather the our custom fields name has a value or not.

$key = 'sub-heading';
$themeta = get_post_meta($post->ID, $key, TRUE);
if($themeta != '') { 
 echo '
'.get_post_meta($post->ID, 'sub-heading', true).'
';
}