Can't get PHP form value with indexer
<p>This is driving me nuts because I'm being sent a form post that includes a name-value pair that looks like this:</p>

<pre><code>&amp;transaction[0].id=5TH49195SG993903B
</code></pre>

<p>In my php receiver file I'm trying to get the value thusly:</p>

<pre><code>$txnid =  $_POST["transaction[0].id"];
</code></pre>

<p>Yet it comes in blank every time. This is from a paypal IPN transmission. I'm not tagging this question for paypal because I don't think it's related to paypal. I can log into paypal and see what they say is the form post, so evidently they are sending that (along with lots of other values).</p>

<p>Am I making some kind of stupid mistake? I'm thinking this has something to do with the [0] indexer because I can successfully get other form values in this same POST, when they don't have an indexer on them. Such as:</p>

<pre><code>$buyer_email =  $_POST["sender_email"];
</code></pre>

<p>What am I doing wrong?</p>
