dynamic svg gradient generator with PHP

gistfile1.txt

	public function generateSvgGradientAction() {

        $from_stop = isset($_GET['from']) ? $_GET['from'] : '000000';
        $to_stop = isset($_GET['to']) ? $_GET['to'] : '000000';

        header('Content-type: image/svg+xml; charset=utf-8');

        echo '<?xml version="1.0"?>
        ';

        ?>
        <svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%">
            <defs>
                <linearGradient id="linear-gradient" x1="0%" y1="0%" x2="0%" y2="100%">
                    <stop offset="0%" stop-color="#<?php echo $from_stop; ?>" stop-opacity="1"/>
                    <stop offset="100%" stop-color="#<?php echo $to_stop; ?>" stop-opacity="1"/>
                </linearGradient>
            </defs>
            <rect width="100%" height="100%" fill="url(#linear-gradient)"/>
        </svg>
        <?php
	}