How to get recent posts from the same category in WordPress

<?php
global $post;
$categories = get_the_category();
$category = $categories[0];
$cat_ID = $category->cat_ID;

$myposts = get_posts("numberposts=20&category=$cat_ID");
?>

<?php foreach($myposts as $post) :?> <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a> <?php endforeach; ?>

Just change numberposts=20 to whatever number you want to display.

Add “&orderby=rand” after 20 if you want the list to be random.