Can we add PHP scripts in our WordPress site in order to add an online tool in our blog?

Yes  can BUT BETTER
 edit the funcions.php of current theme (if you do not going to update or use another theme)


or
 write plugins
 create post types if are needed
.If you work without the Process and Logic of WordPress then better frozen the site (not allow updates), use a good plugin of security like WordFence, and to have often backups.
 

see

How to add analytics in WordPress?
   Once you've set that up, you can install your code.

1. Go to wordpress.org.
2. In the sidebar, click Appearance, and then select Theme File Editor.
3. From the Theme Files sidebar, click Theme Functions (functions. ...
4. Paste the Google Analytics code you previously copied in the text box before the closing </script> tag.

More items... •Sep 17, 2024