$value ) { if ( $value == 'tag' ) unset( $classes[ $key ] ); } return $classes; } // Filter custom logo with correct classes add_filter('get_custom_logo','change_logo_class'); function change_logo_class($html) { $html = str_replace('class="custom-logo"', 'class="img-responsive"', $html); $html = str_replace('class="custom-logo-link"', 'class="navbar-brand" custom-logo-link', $html); return $html; }