moodle-block_mytreestudyplan/view-icon.php

<?php
//header("Content-type: image/svg+xml");
//ob_start();
require_once("../../config.php");

global $CFG;
global $DB;

$skillid = required_param('skillid', PARAM_INT);
$skill = $DB->get_record('block_gradelevel_levelset', array('id' => $skillid));

if(is_object($skill))
{
	$image = $skill->icon;

	if(strncmp($image,"data:",5) == 0)
	{
		$parts = explode(",",ltrim(substr($image,5)),2);
		$typeinfo = explode(";",$parts[0]);
		if(count($typeinfo) > 1 && $typeinfo[1] == "base64")
		{
			$binary = base64_decode($parts[1]);
		}
		else 
		{
			$binary = $parts[0];
		}
		$mime = $typeinfo[0];
		
		// set header
		header("Content-type: {$mime}");
		header("Pragma:");
		// Allow cache for 5 seconds
		header("Cache-Control: public, max-age=5");
		// print data
		print $binary;
	}
	else 
	{
		// redirect to specified url
		header("Location: {$image}",true,302);
	}

}
else 
{
	http_response_code(404);
	print "Image not found";
}