As linked to in the other comment by @AXheladini; you will need to set up Roles and/or Capabilities. Once that is done use the function current_user_can() (codex page) to allow or deny the actual page.
Continued to do more research and ended up finding the solution to my problem! Since the url I am passing the parameter to is /wp-admin/admin.php?page=ecosystem-delete. I didn’t even notice that ?page=ecosystem-delete is already a parameter, so I needed to pass my second parameter into the URL as &id= rather than ?id=. A simple overlooked mistake. … Read more
the best solution to change WORDPRESS role and capabilities is to use User Role Editor plugin. It is simple, very efficient and also give you power to add and modify both roles and capabilities.
I was recently faced with a similar situation and chose to use custom post types. While it’s technically possible to use page hierarchies or categories it would make handling user access too complicated. If my understanding is correct then your desired permalink structure will be there by default: PS: if you want to keep the … Read more
OK now i understand : There was something wrong due to previous manipulations. add_cap is modifying the database, so somehow i had written over other capabilities and it broke the wanted result. So i cleaned the role with the use of a few remove_cap, put my functions back and voilà !
Allow add new post access to custom post but not wp post for some role
Access to CPT but not to ‘post’ post type
“Submit for review” for updates on existing posts
Custom capabilities to add, edit, remove users of a particular role only?
You should use different roles for this groups of users, like CPT-Editor or CPT-Reader. It is much easier to check the role and his capabilities to change on posts. To change this capabilities in the roles use a plugin, like Members, or custom code. The capability for edit, read cpt is different, in dependence of … Read more