Esolz Technologies Interview Questions and Answers

To post a form in PHP, use the method attribute in the form tag to specify 'POST' and set the action attribute to the PHP file that will process the form data.

• Create a form in HTML with method='POST' and action='process.php'

• Use input elements within the form to collect user data

• In the 'process.php' file, use $_POST to access the form data submitted

To upload a file in PHP, use the built-in function move_uploaded_file().

• Create a form with enctype='multipart/form-data'

• Use $_FILES['file']['name'] to get the name of the file

• Use $_FILES['file']['tmp_name'] to get the temporary location of the file

• Use move_uploaded_file() to move the file to the desired location

UI stands for User Interface and refers to the visual elements and layout of a digital product. UX stands for User Experience and focuses on the overall experience and satisfaction of the user.

• UI is the design of the interface, including buttons, menus, and other visual elements.

• UX is the overall experience of the user while interacting with the product.

• UI is concerned with aesthetics and visual appeal.

• UX involves unde...read more

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It provides a centralized store to manage the state of an application.

• Redux follows a unidirectional data flow pattern.

• Actions are dispatched to the store, which updates the state and notifies the UI.

• Selectors can be used to retrieve data from the store.

• Middleware can be used to intercept and modif...read more

Virtual DOM is a lightweight copy of the actual DOM. Routing is the process of navigating between different pages or views.

• Virtual DOM updates only the necessary changes, making it faster than actual DOM manipulation.

• Routing is achieved through a router component that maps URLs to specific components or views.

• React Router is a popular routing library for React applications.

• Routing can be used for creating single-page a...read more