How to simulate PHP execution similar to codeacademy?

Question

PHP

How to simulate PHP execution similar to codeacademy? The first thing that comes to mind: we create a form, write the contents of the form to a file using the php function, then display the corresponding page in the iframe with the result of the executed code. The question is - am I right in my reasoning, and how to do everything beautifully and dynamically, so that the results appear synchronously with the code input in the form window (How it's done on codeacademy)

Answer 1

not to imitate, but to really do it on a virtual machine, in a sandbox