What if you just want a quick SVG image from a encoded string? In this example, we can decode a string, calculate the MBR, and pass the data to a SVG document.
<?php
require 'src/Polyline.php';
require 'examples/EncodedToSVG/EncodedToSVG.php';
$encoded = $_GET['encoded'];
$svg = EncodedToSVG::decodeToSVG($encoded);
header('Content-Type: image/svg+xml');
print $svg;