PHP Interview Questions and Answers
Practice PHP interview questions with clear answers. Covers core syntax, forms, sessions and real backend scenarios for freshers.
PHP Basics
Q. What is PHP?
PHP is a server side scripting language used to build dynamic websites and web applications.
Q. What is the difference between PHP and HTML?
HTML is used for structuring web pages, while PHP is used for backend logic and dynamic content generation.
Q. What is the difference between echo and print?
Echo can output multiple strings and is slightly faster, while print returns a value and can output one string.
Variables and Data
Q. How are variables declared in PHP?
Variables are declared using the dollar sign followed by the variable name, for example $name.
Q. What are data types in PHP?
Common data types include string, integer, float, boolean, array, and object.
Q. What are constants in PHP?
Constants are values that cannot be changed once defined using define or const.
Q. What are arrays in PHP?
Arrays store multiple values in a single variable and can be indexed or associative.
Forms and Requests
Q. What is the difference between GET and POST?
GET sends data through URL and is less secure, while POST sends data through the request body and is more secure.
Q. How does PHP handle form data?
Form data is accessed using superglobals like $_GET and $_POST.
Q. Why is form validation important?
Validation ensures that user input is correct and prevents errors or security issues.
Database and Security
Q. How does PHP connect to a database?
PHP connects to databases using extensions like MySQLi or PDO.
Q. What is SQL injection?
SQL injection is a security vulnerability where attackers insert malicious SQL queries.
Q. What are prepared statements?
Prepared statements are used to prevent SQL injection by separating query logic from data.
Q. How is error handling done in PHP?
Error handling is done using try catch blocks and error reporting functions.
Tips to Crack Technical Interviews
Simple preparation tips to improve your performance across technical interviews for fresher roles.
Understand Core Syntax
Be clear about variables, loops, and basic PHP structure.
Practice Form Handling
Work with forms and data submission to understand real use cases.
Learn Database Basics
Be comfortable with connecting PHP to databases and running queries.
Explain Logic Clearly
Be ready to explain how your backend code works step by step.
Focus on Security
Basic knowledge of validation and SQL injection prevention is important.
Build Small Projects
Create simple dynamic websites to strengthen your understanding.
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