Fenced, line-level PHP:

~~~
<?php
echo fimage();
?>
~~~

Fenced, PHP, line-level PHP:

~~~ php
<?php
echo fimage();
?>
~~~

Fenced, inline HTML:

~~~
I'm just text, but with <b>bold</b> text
~~~

Fenced, PHP, inline HTML:

~~~ php
I'm just text, but with <b>bold</b> text
~~~

Fenced, inline PHP:

~~~
I'm just text, but with <?php echo $bold; ?> text
~~~

Fenced, PHP, inline PHP:

~~~ php
I'm just text, but with <?php echo $bold; ?> text
~~~

Fenced, html line-level:

~~~
<b>
bold text
</b>
~~~

Fenced, PHP, html line-level:

~~~ php
<b>
bold text
</b>
~~~