urce">
<pre><code>require('b.php');

class PDF extends B
{
...
}

$pdf = new PDF();</code></pre>
</div>
</li>

<li id='q14'>
<p><b>14.</b> <span class='question'>How can I open the PDF in a new tab?</span></p>
Just do the same as you would for an HTML page or anything else: add a target="_blank" to your link or form.
</li>

<li id='q15'>
<p><b>15.</b> <span class='question'>How can I send the PDF by email?</span></p>
As for any other file, but an easy way is to use <a href="https://github.com/PHPMailer/PHPM