Does it matter if I reuse a variable after running a function with the same variable?
<p>As the title states, does it matter - will it make any difference?</p>

<p>Example:</p>

<pre><code>$username = $_POST['username'];
$username = mysql_real_escape_string($username);
</code></pre>

<p>Can this cause any problems or is this fine? I've seen a lot of examples, where they create new variables:</p>

<p>Example:</p>

<pre><code>$username = $_POST['username'];
$escaped_username = mysql_real_escape_string($username);
</code></pre>
