WordPress Permalinks for a CPT called "cursos"

permalink-cursos.php

<?php

// Add filter to plugin init function
add_filter('post_type_link', function ($permalink, $post_id, $leavename) {
	$post = get_post($post_id);
	$rewritecode = array(
		$leavename? '' : '%cursos%',
		'%category%',
	);

	if ( '' != $permalink && $post->post_type=='cursos' && !in_array($post->post_status, array('draft', 'pending', 'auto-draft')) ) {
	
		$category = '';
		if ( strpos($permalink, '%category%') !== false ) {
			$cats = get_the_category($post->ID);
			if ( $cats ) {
				usort($cats, '_usort_terms_by_ID'); // order by ID
				$category = $cats[0]->slug;
				if ( $parent = $cats[0]->parent )
					$category = get_category_parents($parent, false, '/', true) . $category;
			}
			// show default category in permalinks, without
			// having to assign it explicitly
			if ( empty($category) ) {
				$default_category = get_category( get_option( 'default_category' ) );
				$category = is_wp_error( $default_category ) ? '' : $default_category->slug;
			}
		}
	 
		$rewritereplace = array(
			$post->post_name,
			$category,
		);
		$permalink = str_replace($rewritecode, $rewritereplace, $permalink);
	} else { // if they're not using the fancy permalink option
	}
	return $permalink;
}, 10, 3);


add_filter('post_rewrite_rules', function($rules){
	return array();
});

add_filter('date_rewrite_rules', function($rules){
	return array();
});

add_action('init', function (){
	global $wp_rewrite;
	$cursos_structure = '/%category%/%cursos%';
	$wp_rewrite->add_rewrite_tag("%cursos%", '([^/]+)', "cursos=");
	$wp_rewrite->add_permastruct('cursos', $cursos_structure, false);
});