Así:
Código PHP:
<?php
file_put_contents('algo.jpg',file_get_contents('http://chart.apis.google.com/chart?chs=150x150&cht=qr&chld=M|0&chl=%3Fre%3Dsase761101e35%26rr%3DDISS870905QP5%26tt%3D1234567890.123456%26id%3Dad662d33-6934-459c-a128-BDf0393f0f44'));
?>