gistfile1.php

<?php
/**
 * View an avatar
 */

$user = elgg_get_page_owner_entity();

// Get the size
$size = strtolower(get_input('size'));
if (!in_array($size, array('master', 'large', 'medium', 'small', 'tiny', 'topbar'))) {
	$size = 'medium';
}

// If user doesn't exist, return default icon
if (!$user) {
	$path = elgg_view("icon/user/default/$size");
	header("Location: $path");
	exit;
}

// Try and get the icon
$filehandler = new ElggFile();
$filehandler->owner_guid = $user->getGUID();
$filehandler->setFilename("profile/" .  $user->getGUID() . $size . ".jpg");

var_dump($filehandler->getFilenameOnFilestore());

$success = false;
if ($filehandler->open("read")) {
	if ($contents = $filehandler->read($filehandler->size())) {
		$success = true;
	}
}

var_dump($contents);

if (!$success) {
	$path = elgg_view('icon/user/default/'.$size);
	header("Location: {$path}");
	exit;
}

header("Content-type: image/jpeg");
header('Expires: ' . date('r', time() + 864000));
header("Pragma: public");
header("Cache-Control: public");
header("Content-Length: " . strlen($contents));

echo $contents;