I have a textarea in which I including outside .php file which contain text. 
<textarea class="form-control" rows="15" id="terms" value="" disabled><?php include 'outsidefile.php'; ?></textarea>
The text is appear on textarea perfectly. The file content is
<?php
     echo 'Some text';
?>
Now i want to make style for this Some text for example
<?php
     echo '<p style="font-size: 46px;text-align: center;">Some text</p>';
?>
But when I load the page I see exactly this <p style="font-size: 46px;text-align: center;">Some text</p> instead of text with size 46px and centered.
How can I do this?