the best way of doing this is WP_Query
$query = new WP_Query(
'post_type' => 'post',
'tax_query' => array(
array(
'taxonomy' => 'my_custom_tag',
'slug' => 'slug',
'terms' => array( 'my_tag_slug' ),
'operator' => 'in',
),
)
);
and you should do the ajax callback like this
add_action( 'wp_ajax_my_action', 'my_action' );
function my_action(){
//my custom code ...
}
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