Interview Questions, PHP . January 8, 2023 . By Ankit Pathak

Top 15 php interview questions and answer for fresher candidates

Top 15 php interview questions and answer for fresher candidates
  1. What is PHP and what is it used for?
    PHP is a server-side scripting language used to develop web applications. It can be embedded into HTML and is commonly used to create dynamic websites, manage databases, and perform other server-side tasks.
  2. What is a PHP script?
    A PHP script is a series of instructions written in the PHP language that is executed on the server when a PHP page is accessed by a user.
  3. How is PHP different from other programming languages?
    PHP is a server-side language, which means that it runs on the server and generates HTML that is then sent to the client. This is in contrast to client-side languages such as JavaScript, which run in the user’s web browser.
  4. How do you declare a variable in PHP?
    In PHP, variables are denoted by a dollar sign ($) followed by the name of the variable. For example:

$myVariable = “Hello World”;

  1. What are the rules for naming a PHP variable?
  • A variable name must start with a letter or an underscore.
  • A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _).
  • A variable name should not contain spaces or special characters.
  1. How do you assign a value to a variable in PHP?
    To assign a value to a variable in PHP, you can use the assignment operator (=). For example:

$myVariable = “Hello World”;

  1. What are the different data types in PHP?
    PHP supports eight primitive data types:
  • integer
  • float
  • string
  • boolean
  • array
  • object
  • null
  • resource
  1. How do you create a constant in PHP?
    To create a constant in PHP, you can use the define() function. For example:

define(“MY_CONSTANT”, “Hello World”);

  1. What is an array in PHP?
    An array in PHP is a data structure that stores a collection of values, which can be of different types. Arrays are typically used to store lists of items, such as a list of names or a list of products.
  2. How do you create an array in PHP?
    There are several ways to create an array in PHP. Here are a few examples:

$myArray = array(“red”, “green”, “blue”);

$myArray = [“red”, “green”, “blue”];

  1. What is a loop in PHP?
    A loop is a control structure in PHP that allows you to repeat a block of code a specified number of times. PHP supports several types of loops, including for, while, and do-while loops.
  2. What is an if statement in PHP?
    An if statement is a control structure in PHP that allows you to execute a block of code if a certain condition is true. If the condition is false, you can specify an optional else block to execute.
  3. What is a switch statement in PHP?
    A switch statement is a control structure in PHP that allows you to execute a block of code based on the value of a variable. It is similar to an if-else statement, but it can be more efficient in certain cases.
  4. What is a function in PHP?
    A function is a block of code that performs a specific task and can be reused throughout your PHP code. Functions can accept parameters and return values.
  5. How do you create a function in PHP?

    To create a function in PHP, you can use the following syntax:

    function functionName($parameters) { // code to be executed }

    Here’s an example of a function that calculates the area of a rectangle:

    function calculateArea($width, $height) { $area = $width * $height; return $area; }

    To call the function, you would use the function name followed by a set of parentheses and any required parameters. For example:

    $result = calculateArea(10, 20);

    This would call the calculateArea() function with the parameters 10 and 20, and the result would be stored in the $result variable.

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