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How can I get all subcategories and the posts related to it

 $term = get_queried_object();
    if($term->post_parent !=0 ){ 

    //  echo 'has parent'; //this post category has child
    $term_id = $term->term_id;
    $taxonomy_name = $term->taxonomy;
    $termchildren = get_term_children( $term_id, $taxonomy_name );
     // echo    $postcat ;
     foreach ($termchildren  as $child) {
    $term = get_term_by( 'id', $child, $taxonomy_name );
             ?>
             // get the categories and if have subcategory get it 


             <?php }?>



     <?php   }
     else{
          //the posts in a subcategory 
    while(have_posts()):the_post();
       // get the subcategory posts

<?php endwhile ?>
<?php  }?>

Note: this is a code for custom taxonomy and the code here exist in a file called taxonomy-($taxonomy_name)

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Try using these codes:

if( isset( $sub_category ) ){ 
 echo '<b>more items in: </b>' . $sub_category->name;
 $args = array(
 'cat' => $sub_category->term_id,
 'post__not_in' => array( get_the_ID() )
 );
 $relatedpostsinsubcategory = new WP_Query( $args );
 if( $relatedpostsinsubcategory->have_posts() ){
 while( $relatedpostsinsubcategory->have_posts() ){
 $relatedpostsinsubcategory->the_post();

 ?>
 <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a> 
<?php
 }
 wp_reset_postdata();
 }
}

You can find more information about getting subcategories and related posts here.

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  • i rally appreciate your help and answer but the situation is that i have a page that contain categories , some of them have subcategories , then posts related to this subcategories , i need the user to show easily this structure , my code get only until the subcategories and every time i try to access the subcategory it reload the category page again with the same subcategory ,so if you can help me and tell me what the wrong with my code i thinks it have a mistake but i can't get it – Nader Elsayed Jan 3 '19 at 16:29

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