<?php
use Imagine\Gd\Imagine;
$imgPath = 'php_logo.png';
$imagine = new Imagine();
$image = $imagine->open($imgPath);
$original = base64_encode($image->get('png'));
$image->flipHorizontally();
$image->rotate(45);
$rotated = base64_encode($image->get('png'));
echo 'original:<br><img src="data:image/png;base64,' . $original . '">' . PHP_EOL;
echo 'rotated:<br><img src="data:image/png;base64,' . $rotated . '">' . PHP_EOL;