Any website with multi-level PHP tests?
<p>I'm not sure if this can be asked here, as it's not directly related to a piece of code.</p>

<p>I'm starting to learn PHP and I'm wondering if there's any websites that have multi-level tests (e.g. beginner/intermediate/advanced) or multi-subject tests (e.g. operators/variables etc).</p>

<p>I just had a go at the w3schools one and hit 95% which isn't too bad, baring in mind it's extremely simplistic, but I'd like a place to test my knowledge in a systematic way, that way when I answer a question incorrectly, I can refer back to sources and focus on those particular weak points.</p>
