What is different between PHP and Core PHP?

[Mola_Ali]

OOP stands for Object-Oriented Programming. Procedural php is about writing procedures or functions that perform operations on the data and is called corephp, while object-oriented php is about creating objects that contain both data and functions.

MVC and frameworks like CodeIgniter, Laravel, Cake PHP and Yii have gotten much popularity in past few years.

[Aldenhussy]

Core PHP is nothing more than vanilla PHP without Laravel, CodeIgniter, or other frameworks. A skilled programmer can build lean, optimized backend logic with it, but bad architecture, messy SQL, and poor refactoring will ruin performance regardless.