An expansion normally opens an API to the PHP software engineer, to enable its offices to be utilized automatically. Nonetheless, a few augmentations which utilize the PHP expansion structure don't open an API to the PHP software engineer. The PDO MySQL driver augmentation, for instance, does not open an API to the PHP software engineer, yet gives an interface to the PDO layer above it. The terms API and expansion ought not be interpreted as meaning something very similar, as an augmentation may not really open an API to the developer. https://webtrackker.com/Best-php-training-institute-center-in-noida-sector-15-16-18.php