Creating a CMS (Content Management System) with PHP involves a structured approach. Here are steps i use in developing a CMS using PHP:

Requirements Gathering: Understand the client's needs, the type of content to be managed, and the functionalities required.

Planning and Design: Create a blueprint of the CMS structure. Design the database schema, considering content types, relationships, and user roles.

Backend Development: Use PHP to build the backend functionalities. This includes user authentication, content creation, editing, and deletion, as well as implementing access control.

Frontend Development: Design the user interface using HTML, CSS, and potentially JavaScript/jQuery for interactivity. Ensure the interface is user-friendly for content management.

Database Integration: Implement the database structure using MySQL or another suitable database management system to store content and user data.

Functionality Implementation: Develop features like WYSIWYG editors, media upload capabilities, SEO settings, and scheduling functionalities for content publishing.

Testing: Thoroughly test the CMS for functionality, security, and usability. Check for vulnerabilities and bugs to ensure a robust system.

Deployment: Deploy the CMS on a server, ensuring it's accessible and performs well under real-world conditions.

Documentation and Training: Provide comprehensive documentation and training materials for users to understand how to operate and manage the CMS.

Maintenance and Support: Offer ongoing maintenance and support to address issues, implement updates, and ensure the CMS remains efficient and secure.

Always prioritize security measures like input validation, preventing SQL injection, and using prepared statements to safeguard against common vulnerabilities. Additionally, consider scalability in the design to accommodate future growth or changes in requirements.