Will users of my site be able to see the content of a .php file?

Me

New member
I'm making a website and have a small part that uses a .php file. The file contains informaiton I don't want leaked (email adress, reCAPTCHA private key). When I test the site locally it shows the php file. So should I worry about website users being able to see the contents of the file?
This is how the HTML links to the php file:
<form action="feedback.php" method="post">[...]</form>
As you may have guessed, I am completely new to PHP.
 
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