get all sub categories without specify any category

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I have 2 levels of categories ( one sub-category only. No sub-sub category ). I need to get all sub categories without parent category. (I don’t want to specify any parent category.)

Example:

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p_cat1
   s_cat1
   s_cat2
p_cat4
p_cat3
   s_cat4
   s_cat5
   s_cat7

from here, I need 

s_cat1
s_cat2
s_cat4
s_cat5
s_cat7

And, I need there to be a URL for each of those sub-categories. I want to give <a> for each subcategory.

How do I do that?

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3 comments

  1. You could use get_categories().

    Returns an array of category objects matching the query parameters.

    Arguments are pretty much the same as wp_list_categories and can be passed as either array or in query syntax.

    // Fetch parent categories
$parent_categories = get_categories( 'parent=0' );

foreach ( $parent_categories as $parent_category ) {
  // Fetch child categories
  $args = array(
    'parent' => $parent_category->term_id
  );

  $categories = get_categories( $args );

  foreach ( $categories as $category ) {
    printf( '<div>%s</div>', $category->name );
  }
}

    This is a very simple example of the code without extra parameters like hide_empty, type etc.

  2. The get_categories function of WordPress returns all the categories, you can loop over the list of categories returned by get_categories and check for the parent property, if parent is ‘0’ then its the parent category other wise it is the sub category.

    function get_sub_categories() {
    $cats = get_categories();
    $subcats = array();
    foreach( $cats as $cat ) {
        if ($cat->parent != '0') {
            $subcats[] = $cat;
        }
    }
    return $subcats;
}

    I don’t know how you want with URL but you can try the following function which will only return Sub categories name hyper linked to their category URLs

    function get_sub_categories() {
    $cats = get_categories();
    $subcats = array();
    foreach( $cats as $cat ) {
        if ($cat->parent != '0') {
            $subcats[] = '<a href="' . get_category_link( $cat->term_id ) .'">' . $cat->name . '</a>';
        }
    }
    return $subcats;
}

  3. function kill_childcat_postlink($link) {
    $result = $link;
    $bloghome = get_bloginfo( 'home' );
    if (preg_match('%' . $bloghome . '/(.*?)/(.*?)/(.*?)/$%i', $link))
        $result = preg_replace('%' . $bloghome . '/(.*?)/.*?/(.*?)/$%i', $bloghome . '/$1/$2/', $link);     
    return $result;
}
add_filter('post_link','kill_childcat_postlink');