i want a query wp for related posts in single page

To display related posts on a single page in WordPress, you can use the following query:

<?php
// Get the current post ID
$current_post_id = get_the_ID();

// Get the categories of the current post
$categories = wp_get_post_categories($current_post_id);

if (!empty($categories)) {
    // Build an array of category IDs
    $category_ids = array();
    foreach ($categories as $category) {
        $category_ids[] = $category;
    }

    // Args for the query
    $args = array(
        'post_type' => 'post',
        'post_status' => 'publish',
        'category__in' => $category_ids,
        'post__not_in' => array($current_post_id),
        'posts_per_page' => 5, // Change the number of related posts to display
    );

    // Query the related posts
    $related_posts_query = new WP_Query($args);

    // Check if there are related posts
    if ($related_posts_query->have_posts()) {
        echo '<h2>Related Posts</h2>';
        echo '<ul>';

        // Loop through the related posts
        while ($related_posts_query->have_posts()) {
            $related_posts_query->the_post();
            echo '<li><a href="' . get_permalink() . '">' . get_the_title() . '</a></li>';
        }

        echo '</ul>';

        // Reset the query
        wp_reset_postdata();
    }
}
?>

You can place this code in your single.php file or in a custom template file if you want to display related posts on a specific page. Remember to modify the posts_per_page value to control the number of related posts to display