Question

vSlider – in WordPress I’m using the function supplied in the FAQs:

<?php if(function_exists('vslider')){ vslider('vslider_options'); } ?>

And I’m trying to do this. So its knows to get the post-ID as its name. But its not working.

<?php if(function_exists('vslider')){ vslider('<?php the_ID(); ?>'); } ?>

Answer 1

You cannot nest <?php ?> inside an already open <?php ?>. That is unsupported and syntactically invalid. Just call the function in place.

Apparently, the_ID() is one of those WordPress functions which prints to the output buffer without returning its value. To get the id returned where it can be useful in a function, use get_the_ID() instead.

<?php if(function_exists('vslider')){ vslider(get_the_ID()); } ?>

The syntax issue becomes more obvious when expressed as properly indented code.

<?php 
if (function_exists('vslider')){
  vslider(get_the_ID());
}
?>