Unable to get the Parent Custom Taxonomy Terms

Question

I am unable to get the Parent Taxonomy Terms here is the code i am writing

$myterms = get_terms( 'iqvis_event_category', array( 'parent' => 0 ) );
echo '<pre>'; 
print_r($myterms);
echo '</pre>';

What is the Reason is there any Syntax problem ? or the parent argument is not working?? because if i am not giving the parent argument its working and getting all the terms with their children.

Answer 1

I figured it out I just have to add another argument and then it was working fine:

$myterms = get_terms( 'iqvis_event_category', array( 'parent' => 0, 'hide_empty' => 0 ) );
echo '<pre>'; 
print_r($myterms);
echo '</pre>';