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Zappi PHP Developer Interview Questions and Answers

Updated 5 Feb 2024

Q1. Technical questions:- difference between echo and print

Ans.

Echo and print are both used to output data in PHP, but echo is slightly faster and can take multiple arguments.

  • Echo is a language construct, while print is a function.

  • Echo does not return a value, while print returns 1.

  • Echo can output multiple strings separated by commas, while print can only output one string.

  • Echo is generally preferred for performance reasons.

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Q2. what is index in mysql

Ans.

An index in MySQL is a data structure that improves the speed of data retrieval operations on a database table.

  • Indexes are created on one or more columns of a table to allow for faster searching and sorting of data.

  • They work by creating a separate data structure that stores the values of the indexed columns in a sorted manner.

  • This allows the database engine to quickly locate the desired data without having to scan the entire table.

  • Indexes can be created on primary keys, uniqu...read more

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Q3. Difference between javascript and jquery

Ans.

JavaScript is a programming language used for client-side scripting, while jQuery is a library built on top of JavaScript.

  • JavaScript is a programming language that allows you to create dynamic web content and interact with the user.

  • jQuery is a library that simplifies JavaScript programming by providing pre-written functions and methods.

  • JavaScript is a core language, while jQuery is a framework built on top of JavaScript.

  • JavaScript can be used for a wide range of tasks, includ...read more

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Q4. What is session and cookies

Ans.

Sessions and cookies are used to store and retrieve data in web applications.

  • Sessions are used to store data on the server side and are identified by a unique session ID.

  • Cookies are used to store data on the client side and are stored as small text files.

  • Sessions are more secure as the data is stored on the server, while cookies can be manipulated by the client.

  • Sessions are typically used to store sensitive information like user login details, while cookies are used for perso...read more

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Discover Zappi interview dos and don'ts from real experiences

Q5. difference between get and post

Ans.

GET and POST are HTTP methods used to send data to a server. GET appends data to the URL while POST sends it in the request body.

  • GET is used for retrieving data from a server while POST is used for submitting data to a server.

  • GET appends data to the URL as query parameters while POST sends it in the request body.

  • GET requests can be bookmarked and cached while POST requests cannot.

  • GET requests have length restrictions while POST requests do not.

  • GET requests are less secure as ...read more

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Q6. Array types and functions

Ans.

Array types and functions

  • PHP arrays can store multiple values of different types

  • Arrays can be indexed numerically or with strings

  • Common array functions include count(), sort(), and array_push()

  • Example: $fruits = ['apple', 'banana', 'orange'];

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Q7. functions in mysql

Ans.

Functions in MySQL are predefined or user-defined routines that perform specific tasks.

  • MySQL functions can be used to manipulate data, perform calculations, and format output.

  • There are various types of functions in MySQL, such as string functions, numeric functions, date and time functions, etc.

  • Examples of MySQL functions include CONCAT(), SUBSTRING(), COUNT(), AVG(), NOW(), etc.

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