TwentyNineteen_SVG_Icons::get_svg( string $group, string $icon, int $size )

31	public static function get_svg( $group, $icon, $size ) {32		if ( 'ui' === $group ) {33			$arr = self::$ui_icons;34		} elseif ( 'social' === $group ) {35			$arr = self::$social_icons;36		} else {37			$arr = array();38		}39		if ( array_key_exists( $icon, $arr ) ) {40			$repl = sprintf( '<svg class="svg-icon" width="%d" height="%d" aria-hidden="true" role="img" focusable="false" ', $size, $size );41			$svg  = preg_replace( '/^<svg /', $repl, trim( $arr[ $icon ] ) ); // Add extra attributes to SVG code.42			$svg  = preg_replace( "/([\n\t]+)/", ' ', $svg ); // Remove newlines & tabs.43			$svg  = preg_replace( '/>\s*</', '><', $svg );    // Remove whitespace between SVG tags.44			return $svg;45		}46		return null;47	}