savefile.php
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	<?php
	// You must first create a file "savefile_config.php" in this extensions directory and do whatever
	// checking of user credentials, etc. that you wish; otherwise anyone will be able to post SVG
	// files to your server which may cause disk space or possibly security problems
	require('savefile_config.php');
	if (!isset($_POST['output_svg'])) {
	print "You must supply output_svg";
	exit;
	}
	$svg = $_POST['output_svg'];
	$filename = (isset($_POST['filename']) && !empty($_POST['filename']) ? preg_replace('@[\\\\/:*?"<>\|]@u', '_', $_POST['filename']) : 'saved') . '.svg'; // These characters are indicated as prohibited by Windows

	$fh = fopen($filename, 'w') or die("Can't open file");
	fwrite($fh, $svg);
	fclose($fh);
	?>