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If you have been working with WordPress for long enough, you have probably come across the term "WP_Error". But what is it exactly?

In simpler terms, WP_Error is a class in WordPress that handles error messages. Whenever an error occurs in your WordPress site, WP_Error takes charge of displaying an error message to the user.

WP_Error is used to standardize error messages and provide a consistent way of handling errors throughout WordPress. It’s also used in functions such as "wp_insert_post" to notify the user if the post was successfully added or not.

Here’s an example of how WP_Error can be used in a WordPress function:

function my_custom_function() {
    $error = new WP_Error();
    $title = 'My Post Title';
    $content = 'My post content';
    $post_id = wp_insert_post(array(
        'post_title'   => $title,
        'post_content' => $content,
        'post_status'  => 'publish'

    if (is_wp_error($post_id)) {
        $error->add('post_error', __('Error creating post.'));
        return $error;
    } else {
        return $post_id;

In this example, we create a custom function that inserts a post into the WordPress database. We use WP_Error to handle any errors that may occur during the insertion process. If an error occurs, we add a custom error message to our WP_Error object and return it. If no error occurs, we return the post ID.

Overall, WP_Error is an essential class in WordPress that provides a standardized way of handling errors. It helps to maintain consistency throughout WordPress and ensures that users are notified when something goes wrong.

Learn More on WordPress.org

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