The first PHP program is typically a "Hello, World!" program, which is a simple program that outputs the text "Hello, World!" to the screen. Here's an example of a simple "Hello, World!" program in PHP:

<?php
echo "Hello, World!";
?>

In this example, we use the echo statement to output the text "Hello, World!" to the screen. The <?php and ?> tags are used to enclose PHP code in an HTML document.

To run this program, you can save it as a file with a .php extension, such as hello.php, and then open the file in a web browser. Alternatively, you can run the program on a web server that supports PHP.

Once you have successfully run the "Hello, World!" program, you can start learning about more advanced PHP concepts and building more complex applications.