get_current_user_id

The function get_current_user_id() in WordPress is a core function that retrieves the ID of the currently logged-in user. If no user is logged in, it returns 0.

$current_user_id = get_current_user_id();

if ($current_user_id) {
    echo "Logged-in user ID: " . $current_user_id;
} else {
    echo "No user is logged in.";
}

Function Definition

• Location: Defined in wp-includes/pluggable.php.
• Returns: int – The user ID if logged in, otherwise 0.

This function is typically used within hooks or templates where you want to identify the user performing the action or viewing the page.