I have a multilingual site setup: www.jeroenbrugman.com

The main dutch version uses Fluxus. On the artwork page I output a link using this from Functions.php

function prefix_term_name($terms, $post_id, $taxonomy ) {
  foreach ($terms as &$term) {
    $term->name = 'Terug naar '.$term->name;
  return $terms;

And on the page itself I show it using this:

 <h3 class="widget-title">
  add_filter( 'get_the_terms','prefix_term_name',10,3);
  the_terms($post->ID, 'fluxus-project-type'); 
  remove_filter( 'get_the_terms','prefix_term_name',10,3); ?>
                                <a href="../"><?php the_terms($post->ID, 'fluxus-project-type'); ?></a></h3>

But, on my English page. I need to output the 'Terug naar' from the main theme function.php as: 'Back To'. but when I copy the code from main functions.php to my child theme's functions.php and change Terug naar to Back to the whole english site goes blank.

What am I doing wrong?

Kind regards

2 Answers 2


You need to make the function pluggable, that means, to support child themes, the functions in parent theme should use:

if ( !function_exists( 'function_name' )) {
    function function_name() {

You should have seen a PHP Error message if you have debugging enabled.

EDIT: The below code snippet if to answer your other question in comment.

function modify_read_more_link() {
    global $post;

    return '<a class="more-link" href="' . get_permalink( $post->ID ) . '">Your Read More Link Text</a>';

add_filter( 'the_content_more_link', 'modify_read_more_link' );
  • So this if ( !function_exists( 'function_name' )) { function function_name() { function prefix_term_name($terms, $post_id, $taxonomy ) { foreach ($terms as &$term) { $term->name = 'Terug naar '.$term->name; } } return $terms; } } Should be in my parent theme's functions.php. And I will be able to use the same code without your code in my child theme's functions.php? Nov 27, 2015 at 21:05
  • I also tried this for the modify_read_more_link function. Making it pluggable in the function.php of my main theme. This didn't work tho. if ( !function_exists( 'modify_read_more_link' )) { add_filter( 'the_content_more_link', 'modify_read_more_link' ); function modify_read_more_link() { return '<a class="more-link" href="' . get_permalink() . '">Read more</a>'; } } This was the code used with your plugging Nov 27, 2015 at 22:03
  • Could you help me one more time? Nov 28, 2015 at 9:08
  • @ginobrugman what happens when you add the code above? Is there any other function with name modify_read_more_link exists in parent theme?
    – Abhik
    Nov 28, 2015 at 10:07
  • I made it pluggable. Even put it above the prefix_term_name function mentioned earlier. None of this works. Also there are no other functions using modify_read_more_link Nov 28, 2015 at 12:29

Issue Fixed!

Had to wrap my function with

if ( !function_exists( 'function_name' )) {
    function function_name() {


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