svgedit/extras/server-save/svg-editor-save.php

<?php
	$svg = $_REQUEST["svg_data"];
	$svg_data = urldecode($svg);
	$file = "saved.svg";
	$fh = fopen($file, "w") or die("Can't open file");
	fwrite($fh, $svg_data);
	fclose($fh);
?>