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PHP
W3 Validator
PHP
In order to put some simple PHP code in a page, take the following steps:
Create .php files and write simple PHP code. Write one per entry point. They are then visible in the navigation module.
Similar to HTML pages, do not have the script output things beyond <body> tag, nor oversized pictures. The CCMS theme is automatically applied to the output.
Make sure the the accessible PHP scripts can be invoked by user without security issues.
It is theoretically possible to embed an existing PHP systems into CCMS as pages. However the direct effort is not light. It is easier to have the system put outside CCMS, make them have the same theme and finally link them with redirect.