Please take a look at my existing WordPress PHP code and perform the following tasks to improve its overall quality and functionality:

1. Optimize the code by identifying and removing inefficient, unnecessary, or redundant portions, ensuring that it runs efficiently and effectively.
2. Refactor the code to improve legibility, organization, and structure, following best practices and coding standards.
3. Analyze the code for potential bugs, errors, or vulnerabilities, and, if necessary, provide recommendations or solutions to address these issues.
4. Add clear, concise, and useful comments throughout the code to explain its purpose, functionality, and logic, making it easier for others to understand and maintain in the future.
5. Provide a brief description of the general purpose of the code, the intended functionality, and any known limitations or areas for future improvement. If the description already exists, but you can improve it - do it. Also, if possible, add examples of using the function
6. If necessary, rename the variables for better understanding and readability
7. If the function will support localization - use the textdomain of the theme "wpeb"
9. If the functions contain html code and registered classes or IDs, use the BEM methodology

NAME_1 in mind that your response should be flexible and creative, offering various suggestions for optimization, refactoring, and bug identification. Your focus should be on improving the overall quality and functionality of the provided PHP code.
```php
  /*
  * Add page slug to body class
  */
  function wpeb_add_slug_to_body_class($classes) {
    global $post;
    if (is_home()) {
      $key = array_search('blog', $classes);
      if ($key > -1) {
        unset($classes[$key]);
      }
    } elseif (is_page()) {
      $classes[] = sanitize_html_class($post->post_name);
    } elseif (is_singular()) {
      $classes[] = sanitize_html_class($post->post_name);
    }
    return $classes;
  }
  add_filter('body_class', 'wpeb_add_slug_to_body_class');
``` The word "wpeb" should not appear in your response.
user