EDIT:
Well, it seems the following approach is a bit DB consuming. Pieter Goosen posted a very interesting alternative. Since this approach has already been accepted as a correct answer I don’t know, it it is possible to mark this question still as a duplicate. I flagged my answer so a moderator might have a look. Thanks.
I first collect all data in an multidimensional array. The subarrays are the categories.
So, I first load all categories with get_categories(). They are ordered by title. I load all of them into $post_categories while the array key is the ID of the category. The category information like the name will be stored in $post_categories[ category_id ]['cat'].
After this I run the query, but I make sure, it is ordered by title. Now, I get all the categories the post is attached to and I save the post in $post_categories[ category_id ]['posts'].
Now I have an multidimensional Array, which I just output with two foreach() loops.
$args = array(
'type' => 'projetos'
);
$all_categories = get_categories( $args );
$post_categories = array();
foreach( $all_categories as $category )
$post_categories[ $category->term_id ]['cat'] = $category;
$args = array(
'post_type' => 'projetos',
'orderby' => 'title',
'order' => 'asc'
);
$my_query = new WP_Query( $args );
if( $my_query->have_posts() ) {
while ($my_query->have_posts()){
$my_query->the_post();
$p = array();
$p['permalink'] = get_the_permalink();
$p['title'] = get_the_title();
foreach( get_the_category() as $category )
$post_categories[ $category->term_id ]['posts'][] = $p;
}
}
foreach( $post_categories as $cat ){
if( ! isset( $cat['posts'] ) || count( $cat['posts'] ) == 0 )
continue;
?>
<strong><?php echo $cat['cat']->name; ?></strong><br />
<?php
foreach( $cat['posts'] as $post ):
?>
<a href="https://wordpress.stackexchange.com/questions/184313/<?php echo $post["permalink']; ?>"><?php echo $post['title']; ?></a><br />
<?php endforeach;
}
wp_reset_query();