For this particular example, I used “Select” choice, creating select custom field type. Into Choices, let’s add few options:

• none
• first choice
• second choice

The third step is to create few custom fields and attach the conditional logic on them. It isn’t important at this point  what kind of fields do we have, as it could be  anything. You could set one custom field to show the post URL, and the other one to show custom URL.

But how would you display custom fields depending on the choice being made? As you probably know, the_field() will display custom field value, but we can also find some use of get_field() here. This is how we could write the PHP function:

<?php
if ( 'none' == get_field('custom_url_toggle')){
    //do nothing
} elseif ( 'first choice' == get_field('custom_url_toggle') ) {
    the_field("custom_url");

} elseif ( 'second choice' == get_field('custom_url_toggle') ) {
   the_field("regular_url");
} 
?>

This function will display nothing if “none” is selected, it will display the content of custom_url field if “first choice”is selected and  regular_url value if the “second choice”is selected.

Post How to set conditional logic in Advanced Custom Fields je prvi puta viđen na bbird.me.