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How do I programmatically get all the terms within a vocabulary for the current language?

This is a similar question to Get translated term name, but not for a single term, but for the entire tree.

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Two issues here:

  1. Getting the current language, and
  2. Getting the terms for the current language

1. Getting the current language

Use the global $language variable and get its language property:

$language->language

2. Getting the terms for the current language

In theory, you'd use i18n_taxonomy_get_tree, like so:

global $language;
$tree = i18n_taxonomy_get_tree(1, $language->language,0,NULL,FALSE);

but it seems that function is buggy. Instead, you can try using i18n_taxonomy_localize_terms with taxonomy_get_tree instead:

if (module_exists('i18n_taxonomy')) { // Check if the module exists
    global $language;
    $tree = i18n_taxonomy_localize_terms(taxonomy_get_tree($VID,0,NULL,FALSE));
} else {
    $tree = taxonomy_get_tree($VID,0,NULL,FALSE);
}

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