'', 'id' => '', 'width' => '450', 'height' => '282', ); $atts = shortcode_atts( $default_atts, $atts, 'twitter-timeline' ); $atts['username'] = preg_replace( '/[^A-Za-z0-9_]+/', '', $atts['username'] ); if ( empty( $atts['username'] ) && ! is_numeric( $atts['id'] ) ) { return ''; } $output = '