function wp_is_mobile() {
  if ( isset( $_SERVER['HTTP_SEC_CH_UA_MOBILE'] ) ) {
    // This is the `Sec-CH-UA-Mobile` user agent client hint HTTP request header.
    // See <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile>.
    $is_mobile = ( '?1' === $_SERVER['HTTP_SEC_CH_UA_MOBILE'] );
  } elseif ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
    $is_mobile = false;
  } elseif ( str_contains( $_SERVER['HTTP_USER_AGENT'], 'Mobile' ) // Many mobile devices (all iPhone, iPad, etc.)
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Android' )
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Silk/' )
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Kindle' )
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'BlackBerry' )
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mini' )
    || str_contains( $_SERVER['HTTP_USER_AGENT'], 'Opera Mobi' ) ) {
      $is_mobile = true;
  } else {
    $is_mobile = false;
  }

  
/**
 * Filters whether the request should be treated as coming from a mobile device or not.
 *
 * @since 4.9.0
 *
 * @param bool $is_mobile Whether the request is from a mobile device or not.
 */
  return apply_filters( 'wp_is_mobile', $is_mobile );
}