How to use ACF Image field as WordPress user profile avatar?

How to use ACF Image field as WordPress user profile avatar?

add_filter('get_avatar', 'lb_acf_profile_avatar', 10, 5);
function lb_acf_profile_avatar( $avatar, $id_or_email, $size, $default, $alt ) {
$field_name = 'lb_local_avatar';
$user = '';
// Get user by id or email
if ( is_numeric( $id_or_email ) ) {
$id = (int) $id_or_email;
$user = get_user_by( 'id' , $id );
} elseif ( is_object( $id_or_email ) ) {
if ( ! empty( $id_or_email->user_id ) ) {
$id = (int) $id_or_email->user_id;
$user = get_user_by( 'id' , $id );
}
} else {
$user = get_user_by( 'email', $id_or_email );
}
if ( ! $user ) {
return $avatar;
}
// Get the user id
$user_id = $user->ID;
// Get the file id
$image_id = get_user_meta($user_id, $field_name, true);
// Bail if we don't have a local avatar
if ( ! $image_id ) {
return $avatar;
}
// Get the file size
$image_url = wp_get_attachment_image_src( $image_id, 'thumbnail' ); // Set image size by name
// Get the file url
$avatar_url = $image_url[0];
// Get the img markup
$avatar = '<img alt="' . $alt . '" src="' . $avatar_url . '" class="avatar avatar-' . $size . '" height="' . $size . '" width="' . $size . '"/>';
// Return our new avatar
return $avatar;
}