how to convert this code?

All the category functions have generic term equivalents, such as get_terms(), term_is_ancestor_of(), get_term_link() etc. You need to do more than rename functions because the generic term functions all take more parameters, namely the taxonomy the term is in. There could be other differences, so check the Codex page for every function you convert.

Already tried that, maybe i am missing something?

The converted code:

<?php
global $ancestor;
$childcats = get_terms('child_of=' . $cat . '&hide_empty=1');
foreach ($childcats as $childcat) {
  if (term_is_ancestor_of($ancestor, $childcat->cat_ID) == false){
    echo '<a class="trick product-search-item" href="'.get_term_link($childcat->cat_ID).'">';

	echo '<img src=';
	echo z_taxonomy_image_url($childcat->term_id);
	echo '>';
	echo '<div class="icon"></div>';
	echo '<span>';
	echo $childcat->cat_name . '</span>';
    echo '</a>';
    $ancestor = $childcat->cat_ID;
  }
}
?>

Shows this error:

Warning: Missing argument 3 for term_is_ancestor_of(), called in URL on line 23 and defined in D:\zEasyPHP-DevServer\data\localweb\decor\wp-includes\taxonomy.php on line 1542

Catchable fatal error: Object of class WP_Error could not be converted to string in D:\zEasyPHP-DevServer\data\localweb\decor\wp-content\themes\dd\taxonomy-parchet-cats.php on line 24

You need to specify the taxonomy to which the terms belong as the missing 3rd argument.

The second error is because you have no error checking code for the return of a function, so you are probably trying to echo out a WP_Error object. Ideally you should insert error handling script, but eliminating the cause of the error could suffice if all input is managed such that another error is highly unlikely.

tried this but failed:

<?php
global $ancestor;
$childcats = get_terms('parchet-cats', 'child_of=' . $cat . '&hide_empty=1');
foreach ($childcats as $childcat) {
  if (cat_is_ancestor_of($ancestor, $childcat->term_id) == false){
    echo '<a class="trick product-search-item" href="'.get_term_link($childcat->term_id, 'parchet-cats').'">';

    echo '<img src=';
    echo z_taxonomy_image_url($childcat->term_id);
    echo '>';
    echo '<div class="icon"></div>';
    echo '<span>';
    echo $childcat->term_name . '</span>';
    echo '</a>';
    $ancestor = $childcat->term_id;
  }
}
?>

Shows this error:

Catchable fatal error: Object of class WP_Error could not be converted to string in D:\zEasyPHP-DevServer\data\localweb\decor\wp-content\themes\dd\taxonomy-parchet-cats.php on line 24

Can you enlight me where i wrong?

LOL i’m not good at this

ok I had updated your code, try it and tell if it works or not:

<?php
global $ancestor;
$childcats = get_terms('parchet-cats', 'child_of=' . $cat . '&hide_empty=1');
foreach ($childcats as $childcat) {
  if (cat_is_ancestor_of($ancestor, $childcat->term_id) == false){
    echo '<a class="trick product-search-item" href="'.get_term_link($childcat->slug, 'parchet-cats').'">';

    echo '<img src=';
    echo z_taxonomy_image_url($childcat->term_id);
    echo '>';
    echo '<div class="icon"></div>';
    echo '<span>';
    echo $childcat->name . '</span>';

    echo '</a>';
    $ancestor = $childcat->term_id;
  }
}
?>

closer, but shows all categories, not child of parent

here: https://s14.postimg.org/ixy27qtsx/pic1.png
and here: https://s14.postimg.org/kyolskpy9/pic2.png

trying final code

THIS CODE WORKED

<?php
global $ancestor;
$cat = $wp_query->queried_object->term_id;
$childcats = get_terms('parchet-cats', 'parent=' . $cat . '&hide_empty=1');
foreach ($childcats as $childcat) {
  if (cat_is_ancestor_of($ancestor, $childcat->term_id) == false){
    echo '<a class="trick product-search-item" href="'.get_term_link($childcat->slug, 'parchet-cats').'">';

    echo '<img src=';
    echo z_taxonomy_image_url($childcat->term_id);
    echo '>';
    echo '<div class="icon"></div>';
    echo '<span>';
    echo $childcat->name . '</span>';
    echo '</a>';
    $ancestor = $childcat->term_id;
  }
}
?>

how to display category parents only of an taxonomy in archive-{taxonomy-slug}.php

?

@christedor – I’m not sure what you are actually asking for. Display posts belonging to category parent or just show the category parent as a label, or as a link to the corresponding archive? What of the current category posts? Still displayed? Mixed in with parent posts? Only show parent posts? There’s many possibilities, you’ll need to be very specific.

FYI, adding on to existing topics is not allowed in these forums. Please start a new topic and fully describe what you are trying to accomplish.

@bcworkz

I have a custom post type named, “Countries”
Taxonomy is called “Countries-categories”

I want to display only parent categories of taxonomy “countries-categories” in my archive-countries.php

So my archive page will look like this:
Europe
-country1
-country2
Asia
-country1
-country2
Africa
-country1
-country2

ETC..

Then after the that taxonomy-countries-categories.php will do its thing with the last code “cipriano200” posted, also that code displays image for category, with CATEGORIES IMAGES PLUGIN, so i want that to.

Sorry if i broke the rules, but this topic is close in what i need.

i solved the problem somehow