I have the same problem on exercise 6, every time a different error message and then the browser just freezes. I changed browser and it froze again, as it happened also in previous exercises.
Here's my code:
$loopCond = false;
echo "<p>The loop ran even though the loop condition is false.</p>";
} while ($loopCond = true);
echo "<p>Now the loop is done running.</p>";