Perfect Interview Questions and Answers

Php array is a data structure that stores multiple values under a single variable name.

• Arrays can hold values of different data types

• Values in an array are accessed using their index number

• Arrays can be created using the array() function or shorthand []

• Arrays have various built-in functions for manipulation

PHP is a server-side scripting language used for web development.

• PHP stands for Hypertext Preprocessor.

• It is an open-source language and can be embedded in HTML.

• PHP is used for creating dynamic web pages and web applications.

• It can interact with databases and handle forms and cookies.

• Popular websites like Facebook, Wikipedia, and WordPress are built using PHP.

HTML is a markup language used for creating web pages, while PHP is a server-side scripting language used for dynamic web development.

• HTML stands for HyperText Markup Language and is used to create the structure of web pages.

• PHP stands for Hypertext Preprocessor and is used for server-side scripting to generate dynamic content on web pages.

• HTML is static, while PHP allows for dynamic content generation based on user in...read more

Javascript is a scripting language used for web development. It can be used with Core PHP to add interactivity to websites.

• Javascript is a client-side scripting language that runs in the browser

• It can be used to add interactivity to websites, such as form validation and dynamic content

• Core PHP is a server-side scripting language used to generate HTML pages

• Javascript can be used with Core PHP to create dynamic web pages

• ...read more

MySQL Database Connectivity to PHP is a way to connect PHP scripts to MySQL databases.

• MySQLi and PDO are two PHP extensions used for database connectivity.

• MySQLi is an object-oriented extension while PDO is a data access abstraction layer.

• Both extensions provide methods to connect to MySQL databases, execute queries, and fetch results.

• Example: $conn = new mysqli($servername, $username, $password, $dbname);

• Example: $con...read more

To create a simple form in PHP using HTML and display in a web browser, you need to write HTML code for the form and embed PHP code to handle form submission.

• Create an HTML form with input fields for user input

• Use PHP code to process form data and display results

• Save the file with a .php extension to enable PHP code execution

PHP variables are containers for storing data values. There are 4 types of variables in PHP.

• PHP variables start with a $ sign followed by the variable name

• PHP has 4 types of variables: string, integer, float, and boolean

• Variables can be assigned values using the assignment operator (=)

• Variables can be used in expressions and can be concatenated with strings

• Example: $name = 'John'; $age = 25; $salary = 2500.50; $isEmplo...read more

OOPS in PHP is a programming paradigm that uses objects to represent real-world entities and their interactions.

• OOPS stands for Object-Oriented Programming System

• It allows for encapsulation, inheritance, and polymorphism

• Classes and objects are used to represent real-world entities and their interactions

• Example: A class 'Car' can have properties like 'model', 'color', and 'price', and methods like 'start', 'stop', and '...read more

Constructor and Destructor are special methods in a class that are used to create and destroy objects respectively.

• Constructor is a method that is called when an object of a class is created.

• Destructor is a method that is called when an object is destroyed.

• Class is a blueprint or template for creating objects.

• Object is an instance of a class.

• Constructor and Destructor are related to Class and Object as they are used to...read more

Call by Value passes a copy of the value, while Call by Reference passes a reference to the value.

• Call by Value passes a copy of the value to the function, so any changes made to the value inside the function do not affect the original value outside the function.

• Call by Reference passes a reference to the value to the function, so any changes made to the value inside the function affect the original value outside the f...read more

An array is a data structure that stores multiple values in a single variable. PHP has several data types including string, integer, float, boolean, and more.

• PHP arrays can hold values of different data types.

• There are indexed arrays, associative arrays, and multidimensional arrays in PHP.

• Indexed arrays use numeric keys to access values.

• Associative arrays use named keys to access values.

• Multidimensional arrays are arra...read more

A trigger is a piece of code that automatically executes when an event occurs in a database.

• Triggers are useful for enforcing business rules and data integrity.

• They can be used to audit changes to data in a database.

• In PHP, triggers can be created using the mysqli extension or PDO.

• Examples of trigger events include INSERT, UPDATE, and DELETE operations on a table.