Protect php code from being erased in articles

Hello

In some articles of my site, I need to introduce php code (php.exec managed). But if, by mistake, I switch to visual editor, my code is erased.

I am not the only admin of the site. And I do fear that the php codes will often be erased by mistake by other editors or writers that need to modify stuff.

Is there a way to protect this code (apart form disabling the visal editor… which is NOT an option when you manage a team).