I filter my WP_Query by this script:
$args = array ( 'posts_per_page' => $posts_per_page, 'post_type' => $post_type, 'meta_key' => 'post_views_count', 'orderby' => 'meta_value_num', 'showposts' => 160, 'order' => 'DESC', 'paged' => $paged, 'tax_query' => array( array( 'taxonomy' => $term->taxonomy, 'field' => 'slug', 'terms' => $term->name) ));
And I would like to add the filter
SUBSTRING(post_title, 1,1) ='z'.
it possiable to implement it?
what's the best practices to loop only post which start with X letter?