Use of wp-reset-postdata() in WordPress

In WordPress, wp_reset_postdata() is a function used to reset the global $post variable back to the current post in the main query. It’s commonly used after a custom loop or secondary query using WP_Query to restore the global post data to the main query.

When you run a custom query using WP_Query, it changes the global $post variable to the first post in that custom query. So, if you want to use template tags or functions that rely on the main query’s post data after running a secondary query, you’ll need to reset the global $post variable back to the main query’s post.

Here’s an example of how wp_reset_postdata() is used:

<?php
// Custom query
$custom_query = new WP_Query( $args );
if ( $custom_query->have_posts() ) {
    while ( $custom_query->have_posts() ) {
        $custom_query->the_post();
        // Display post content or perform other actions
    }
    // Reset postdata
    wp_reset_postdata();
}
// Now you can use template tags or functions relying on the main query's post data
?>

This function ensures that WordPress continues to work as expected after using custom queries, preventing unexpected behavior due to changes in the global $post variable.