In order to get bold text, you need to use font-weight and to get the simple text you can use <span> tag. All this gets added in the echo.
The PHP code is as follows
<!DOCTYPE html> <html> <body> <?php echo '<span style="font-size: 20px; color: #006400; font-weight: bold;">This is my first PHP Program</span> '.$row['data']; ?> </body> </html>
Here is the snapshot of sample output.
This is my first PHP Program