separate the post of a category by subcategory

Question

I'm dynamically generating my category post by getting the Page title and match it with the category name. The category I'm posting sometimes has a subcategory now I need to separate this subcategory by groups. I'm using this code.

<ul>
<?php 
    global $post;
    $post_slug = get_the_title(); 
    $args = array ( 'category_name' => $post_slug, 'posts_per_page' => -1, 'orderby' => title, 'order' => ASC);
    $myposts = get_posts( $args );
    foreach( $myposts as $post ) :  setup_postdata($post); ?>
    <li>
        <strong><?php the_title(); ?></strong>
        <?php the_content(); ?>
    </li>
<?php endforeach; ?>
</ul>

I need to call my category only by using the page title. since I'm using a template that post different category and controlling it by name title of the page. Not quite sure if I can convert that to category => ID

Please see link here for the explanation and mock

Found this thread not sure if its going to fit on what I did? also this one

Answer 1

You can use get_term_by to get a category by name-

$category = get_term_by( 'name', $post_slug, 'category' );
echo $category->term_id;

Answer 2

Did this before for a website. Here's what i did:
Checked if there is a category with the same name as the title:

if( term_exists(get_the_title(), 'category' ))

If there was one then I got the category by slug:

$cat = get_term_by("slug", $post->post_name, "category"); 

Checked if category had parent or was a parent:

if($cat->parent !== 0) {
    $catID = $cat->parent;
} else {
    $catID = $cat->term_id;
}  

Then retrieved categories by said parent:

$args = array(
                'type'                      => 'post',
                'child_of'                  => $catID,
                'hide_empty'                  => false,
                'hierarchical'              => true,
                'exclude'                   => '1'
            );
$categories = get_categories($args);

Then a simple loop with links:

foreach($categories as $categorie) {
    if($categorie->slug == $post->post_name) {
        $clasa = "class='current'";
    } else {
        $clasa = "";
    }
    echo "<a ".$clasa." href='".home_url("/").$slug."/".$categorie->slug."'>".$categorie->name."</a>";
}

Hope this is what you are looking for.

Answer 3

Inside your parent post/category loop use this to generate a list of post titles/category names of the child posts/categories:

$taxonomy_name = 'category';
$this_term = get_term_by( 'name', get_the_title(), $taxonomy_name );

$term_id = $this_term->term_id;
$termchildren = get_term_children( $term_id, $taxonomy_name );

echo '<ul>';
foreach ( $termchildren as $child ) {//get the children and search the posts by title

  $term = get_term_by( 'id', $child, $taxonomy_name );
  $args = array ( 'post_title' => $term->name, 'orderby' => title, 'order' => ASC);
  $myposts = get_posts( $args );
  foreach( $myposts as $post ) :  setup_postdata($post); ?>
    <li>
      <strong><?php the_title(); ?></strong>
      <?php the_content(); ?>
    </li>
<?php endforeach; ?>

}
echo '</ul>';

UPDATE: Let's try that again. Inside your parent post/category loop use this . . .

$taxonomy_name = 'category';
$this_term = get_term_by( 'name', get_the_title( get_the_ID() ), $taxonomy_name );

$categories = get_categories( array(
        'orderby' => 'name',
        'child_of'  => $this_term->term_ID,
    ) );

if ( ! empty( $categories ) ) {

    foreach ( $categories as $category ) {
        $this_post = get_page_by_title( $category->name, OBJECT, 'post');
        echo '<h3>' . $this_post ->post_title . '</h3>';

    }
}