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Core php means pure php or vanilla php.
That means making the project with php without any frameworks.

CorePHP means pure php with using any frameworks. Core PHP is very basic PHP. It is used to create dynamic web pages. ... So it is very important to learn core or principle PHP programming to create dynamic web applications. You can see more about PHP from the official site of PHP Hypertext Preprocessor.

Hi akshayghogare ,
Core PHP means complete Basic or Pure PHP there are no any frameworks or Supporting libraries involved in it. All development is done from scratch.