how to call the category of the post

Question

I jus want to create a gallery which shows either all or certain number of posts in that category under each post and i found a working code

<?php
$displayposts = new WP_Query();
  //get posts from your news category
  $displayposts->query('cat=5');
while ($displayposts->have_posts()) : $displayposts->the_post();
?>
<?php the_content('read more...'); ?>
<?php edit_post_link('edit', '', ''); ?>
<?php endwhile; ?>

in the above code i want to enter the specific category instead of cat=5

Answer 1

Well first off, that code's a mess to read, some formatting would definitely help get you an answer. That said, here's the documentation on WP_Query and some sample code to boot

$args = array(
    'post_status' => 'publish',
    'tax_query'   => array(
        array(
            'taxonomy' => 'category',
            'field'    => 'slug',
            'terms'    => 'your_cat_slug'
        )
    ) 
);
$posts = new WP_Query( $args );

I've used 'tax_query' rather than 'category_name' because I feel it is more flexible while being more understandable (and thus easy to use) at the same time, if you have any issues with understanding the code, read the documentation, WP_Query is SO well documented it's crazy.

edit

Updated code

$cats = array();
foreach( get_the_category() as $cat ) {
    $cats[] = $cat->cat_ID;
}
$args = array(
    'post_status'    => 'publish',
    'posts_per_page' => -1,
    'tax_query' => array(
        array(
            'taxonomy'         => 'category',
            'field'            => 'id',
            'terms'            => $cats,
            'include_children' => false
        )
    )
);
print_r( WP_Query( $args ) as $post );