PHP Developer
200+ PHP Developer Interview Questions and Answers
Q51. Tel me about HTML and Tel me about basics in python
HTML is a markup language used for creating web pages. Python is a high-level programming language known for its simplicity and readability.
HTML stands for HyperText Markup Language and is used to create the structure of web pages.
Python is a versatile programming language known for its clean syntax and ease of use.
HTML uses tags to define elements on a web page, such as headings, paragraphs, and images.
Python is often used for web development, data analysis, artificial intel...read more
Q52. Explain about Abstract Class and PHP Interface?
Abstract classes and interfaces are used to define common methods and properties for classes to implement.
Abstract classes cannot be instantiated and can contain both abstract and non-abstract methods.
Interfaces only contain method signatures and constants, and classes can implement multiple interfaces.
Abstract classes are useful for creating a base class with common functionality, while interfaces are useful for defining a contract for classes to follow.
Example: abstract cla...read more
Q53. How can handle exceptions?
Exceptions can be handled using try-catch blocks in PHP.
Use try-catch blocks to enclose the code that may throw an exception.
Catch the exception using catch block and handle it appropriately.
Multiple catch blocks can be used to handle different types of exceptions.
Finally block can be used to execute code regardless of whether an exception occurred or not.
Q54. Difference between include and include_once?
include() includes and evaluates a specified file, while include_once() does the same but ensures the file is only included once.
include() can include the same file multiple times, while include_once() will only include it once
include() will continue to execute the script even if the file is not found, while include_once() will throw a warning and continue
include_once() is useful for preventing multiple declarations of functions or classes
Q55. What is opps What is object PHP - What is Inheritance
OOPs stands for Object-Oriented Programming. An object is an instance of a class in OOP. Inheritance is a feature in OOP where a class can inherit properties and methods from another class.
OOPs stands for Object-Oriented Programming
An object is an instance of a class in OOP
Inheritance is a feature in OOP where a class can inherit properties and methods from another class
Q56. what is helpers in coddeigniter?
Helpers in CodeIgniter are utility functions that assist in common tasks and can be used throughout the application.
Helpers are standalone functions that can be loaded and used anywhere in the application.
They provide a way to avoid writing repetitive code by providing ready-to-use functions.
CodeIgniter comes with a set of built-in helpers, such as URL, Form, File, and Date helpers.
Custom helpers can also be created to extend the functionality of the framework.
Helpers are loa...read more
Share interview questions and help millions of jobseekers 🌟
Q57. what is index in mysql
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
Q58. Difference between javascript and jquery
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
PHP Developer Jobs
Q59. Difference between javascript and jquery Query for CRUD operations what is require() and include()
JS vs jQuery, CRUD query, require() vs include()
JavaScript is a programming language while jQuery is a library built on top of it
CRUD operations can be performed using AJAX in both JS and jQuery
require() is used in Node.js to import modules while include() is used in PHP
Q60. How to fetch data from database how to insert data into database
To fetch data from database, use SELECT statement. To insert data into database, use INSERT statement.
Use SELECT statement with appropriate conditions to fetch data from database
Use INSERT statement with appropriate values to insert data into database
Make sure to sanitize user inputs to prevent SQL injection attacks
Q61. What is difference between padding and margin ?
Padding is the space inside an element, while margin is the space outside an element.
Padding is used to create space between the content and the border of an element.
Margin is used to create space between elements or between an element and its parent.
Padding affects the size of the content area, while margin affects the positioning of the element.
Padding is transparent and does not have a background color, while margin can have a background color.
Q62. write A program to determine valid parenthesis
A program to determine valid parenthesis
Use a stack data structure to keep track of opening parenthesis
Iterate through the string and push opening parenthesis onto the stack
If a closing parenthesis is encountered, check if the stack is empty or the top element is not the corresponding opening parenthesis
If the stack is empty or the top element is not the corresponding opening parenthesis, the string has invalid parenthesis
After iterating through the string, if the stack is em...read more
Q63. write query for select second highest salary from table
Query to select second highest salary from a table
Use ORDER BY clause to sort salaries in descending order
Use LIMIT to select the second row after skipping the first row
Q64. What is session and cookies
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
Q65. What is middleware and its type
Middleware is software that acts as a bridge between an application and the server, handling requests and responses.
Middleware can modify incoming requests before they reach the application.
It can also modify outgoing responses before they are sent back to the client.
Types of middleware include authentication middleware, logging middleware, error handling middleware, etc.
Examples of middleware in PHP frameworks include Laravel's middleware for authentication and authorization...read more
Q66. Create database and insert data , update data , delete data in database.
Creating, inserting, updating, and deleting data in a database using PHP.
Create a database connection using PHP's mysqli or PDO extension
Use SQL queries to create tables, insert data, update data, and delete data
Example: CREATE TABLE users (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50), email VARCHAR(50));
Example: INSERT INTO users (name, email) VALUES ('John Doe', 'john.doe@example.com');
Example: UPDATE users SET email = 'johndoe@example.com' WHERE id = 1;
Example: DELE...read more
Q67. Database and it's query , create database and insert data in database.
Creating a database and inserting data using SQL queries.
Create a database using CREATE DATABASE statement
Use INSERT INTO statement to add data to the database
Ensure proper data types and constraints are defined
Q68. difference between primary key and secondary key?
Primary key uniquely identifies a record while secondary key is used for data retrieval and sorting.
Primary key is a unique identifier for a record in a table.
Secondary key is used for data retrieval and sorting.
A table can have only one primary key but multiple secondary keys.
Primary key cannot have null values while secondary key can have null values.
Primary key is automatically indexed while secondary key needs to be indexed manually.
Q69. how to manage a session in case of payment gateway
Session management for payment gateway
Use secure HTTPS connection for communication
Store sensitive data in encrypted format
Set session timeout to a short duration
Use unique session IDs for each transaction
Destroy session after successful payment or on timeout
Q70. working project experience technologies growth goal (long term, short term)
I have 5 years of experience as a PHP Developer with expertise in various technologies. My goal is to continue growing in my career.
5 years of experience as a PHP Developer
Proficient in various technologies such as PHP, MySQL, HTML, CSS, JavaScript
Worked on multiple projects, including e-commerce websites and content management systems
Continuously learning and staying updated with the latest trends and advancements in PHP development
Goal is to further enhance my skills and co...read more
Q71. what interests you about Bridcodes and this role?
I am interested in Bridcodes because of their innovative projects and the opportunity to work with cutting-edge technologies.
Exciting projects that push boundaries
Opportunity to work with new technologies like Laravel and Vue.js
Positive company culture and growth opportunities
Q72. Define constructor, magic methods, static methods, abstract class, traits, namespace, interface
Definitions of key concepts in PHP development
Constructor: Special method used to initialize objects in a class
Magic methods: Predefined methods in PHP classes that start with __
Static methods: Methods that can be called without instantiating a class
Abstract class: Class that cannot be instantiated and may contain abstract methods
Traits: Reusable code that can be included in multiple classes
Namespace: A way to organize code by grouping related classes, interfaces, functions, ...read more
Q73. What is the default join in MySQL?
The default join in MySQL is INNER JOIN.
INNER JOIN is the most commonly used join in MySQL.
It returns only the matching rows from both tables.
Other types of joins include LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.
Q74. Give 5 names of array functions in PHP.
Array functions in PHP are used to manipulate arrays in various ways.
array_push() - adds one or more elements to the end of an array
array_pop() - removes and returns the last element of an array
array_merge() - merges one or more arrays into a single array
array_slice() - extracts a slice of an array
array_search() - searches an array for a specific value and returns the corresponding key if successful
Q75. reverse your name , shifted the table printed number according to evne and odd
Reverse the name and shift the printed numbers based on even and odd positions.
Reverse the name: 'John Doe' becomes 'eoD nhoJ'
Shift the table printed numbers based on even and odd positions
For example, if the table printed numbers are 1, 2, 3, 4, 5, the shifted numbers would be 2, 1, 4, 3, 5
Q76. What is inheritance and type of inheritance
Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
Inheritance allows a class to reuse code from another class.
There are different types of inheritance: single inheritance, multiple inheritance, multilevel inheritance, and hierarchical inheritance.
Example: Class B inherits from Class A, so Class B can access all the properties and methods of Class A.
Q77. difference between get and post
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
Q78. What is unset and unlink in php
unset and unlink are functions in PHP used to remove variables and files respectively.
unset is used to destroy a variable and free up memory
unlink is used to delete a file from the server
Both functions return a boolean value indicating success or failure
unset can be used on arrays, objects, and variables
unlink can be used with a file path or a file handle
Q79. How to send data from pone page to another page
Data can be sent from one page to another using methods like GET, POST, SESSION, COOKIES, and AJAX.
Use GET method to send data through URL parameters
Use POST method to send data through form submissions
Use SESSION to store data temporarily across multiple pages
Use COOKIES to store data on the client side
Use AJAX to send data asynchronously without reloading the page
Q80. Advantage of PHP over Dot net and JAVA
PHP is advantageous over Dot net and JAVA due to its simplicity, flexibility, and cost-effectiveness.
PHP is open-source and free to use, while Dot net and JAVA require licenses.
PHP is easy to learn and has a low barrier to entry compared to Dot net and JAVA.
PHP is platform-independent, allowing for greater flexibility in deployment.
PHP has a large community and extensive documentation for support and resources.
Q81. Sort Array in PHP without using any function.
Sort an array in PHP without using any function.
Use a sorting algorithm like bubble sort or insertion sort.
Iterate through the array and compare adjacent elements to swap them if necessary.
Repeat the process until the array is sorted.
Q82. Tell about encapsulation, polymorphism, abstraction
Encapsulation, polymorphism, and abstraction are key concepts in object-oriented programming.
Encapsulation is the bundling of data and methods that operate on that data into a single unit. It helps in data hiding and prevents direct access to data.
Polymorphism allows objects of different classes to be treated as objects of a common superclass. It enables flexibility and reusability in code.
Abstraction involves hiding the complex implementation details and showing only the nec...read more
Q83. What is the difference between slice and splice ?
Slice is used to extract a portion of an array without modifying the original array, while splice is used to add or remove elements from an array.
Slice returns a shallow copy of a portion of an array into a new array without modifying the original array.
Splice changes the contents of an array by removing or replacing existing elements or adding new elements in place.
Example: let arr = [1, 2, 3, 4, 5]; arr.slice(1, 3) will return [2, 3] while arr.splice(1, 2) will modify arr t...read more
Q84. What to do think what is important fora client?
Understanding the client's needs, providing quality service, clear communication, and building a strong relationship are important for a client.
Understanding the client's requirements and expectations
Providing high quality service or product
Maintaining clear and open communication
Building a strong and trusting relationship with the client
Q85. Difference between candidate key and foreign key
Candidate key uniquely identifies a record in a table, while foreign key establishes a relationship between two tables.
Candidate key is a unique key that can be used to uniquely identify a record in a table.
Foreign key is a key that establishes a relationship between two tables.
Candidate key can be a primary key or a unique key, while foreign key references a primary key in another table.
Example: In a 'students' table, 'student_id' can be a candidate key, while 'department_id...read more
Q86. Write SQL query for thirst highest salary from employees table
SQL query to find the third highest salary from employees table.
Use the ORDER BY clause to sort salaries in descending order.
Use the LIMIT clause to retrieve the third highest salary.
Consider handling cases where there may be ties for the third highest salary.
Q87. What are arrays and objects
Arrays and objects are data structures used in programming to store multiple values or properties.
Arrays are ordered collections of values accessed by index.
Objects are collections of key-value pairs where values are accessed by keys.
Example of array: $colors = ['red', 'blue', 'green'];
Example of object: $person = ['name' => 'John', 'age' => 30];
Q88. how much time you take to build a complete website
The time taken to build a complete website varies depending on the complexity and requirements of the project.
The time can range from a few days for a simple website to several months for a complex e-commerce platform.
Factors such as design complexity, functionality, integration of third-party services, and testing can impact the development time.
Using frameworks like Laravel or Symfony can speed up development process compared to building from scratch.
Collaboration with a te...read more
Q89. What are keys and joins in sql?
Keys and joins are important concepts in SQL for relating tables and retrieving data based on relationships.
Keys in SQL are used to uniquely identify records in a table. Primary keys are used to uniquely identify each record in a table, while foreign keys are used to establish relationships between tables.
Joins in SQL are used to combine rows from two or more tables based on a related column between them. Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FU...read more
Q90. What is indexing,trigger,stored procedure
Indexing, triggers, and stored procedures are database concepts used to optimize performance and automate tasks.
Indexing is a technique used to improve the speed of data retrieval operations in a database by creating indexes on columns.
Triggers are special types of stored procedures that are automatically executed in response to certain events on a table, such as insert, update, or delete operations.
Stored procedures are precompiled SQL statements that are stored in the datab...read more
Q91. Difference between Unlink and Unset?
Unlink is used to delete a file from the filesystem, while unset is used to unset a variable.
Unlink is used to delete a file from the filesystem in PHP.
Unset is used to unset a variable in PHP.
Unlink requires the file path as an argument, while unset requires the variable name.
Q92. How namespace is different to class Name
Namespaces are used to avoid naming conflicts between classes, functions, and variables, while class names are used to define blueprints for objects.
Namespaces are used to organize code into logical groups, preventing naming collisions.
Class names define blueprints for objects and can be instantiated to create objects.
Namespaces can be nested within each other, while classes cannot be nested.
Namespaces are declared using the 'namespace' keyword, while classes are declared usi...read more
Q93. Logical flowchart of project and development method
The logical flowchart of a project outlines the steps involved in its development. Various development methods can be used.
Identify project requirements and objectives
Create a flowchart to outline the logical steps involved in the project
Choose a development method such as Agile or Waterfall
Implement the project using the chosen method
Test and debug the project
Deploy the project and maintain it
Q94. How do you reverse a list in Python?
To reverse a list in Python, you can use the built-in reverse() method or slicing technique.
Use the reverse() method to reverse the list in place: list.reverse()
Use slicing to create a new reversed list: reversed_list = list[::-1]
Q95. Implement upload of file using Ajax?
Ajax can be used to upload files without refreshing the page.
Create a form with file input and submit button.
Use FormData object to collect form data.
Send data to server using Ajax.
Handle file upload on server side.
Return response to client and update UI.
Q96. What are commands in laravel?
Commands in Laravel are artisan commands that help developers perform various tasks such as database migrations, seeding, and creating controllers.
Artisan commands are run through the command line interface using the 'php artisan' command.
Some common artisan commands include 'php artisan migrate' for running database migrations, 'php artisan db:seed' for seeding the database with dummy data, and 'php artisan make:controller' for creating a new controller.
Developers can also c...read more
Q97. What is Eloquent ORM?
Eloquent ORM is an advanced PHP implementation of the Active Record pattern for working with databases.
Eloquent ORM is included with the Laravel PHP framework.
It allows developers to interact with databases using PHP objects instead of writing SQL queries.
Eloquent models represent database tables and can be used to perform CRUD operations.
Relationships between database tables can be defined using Eloquent's model relationships.
Q98. what is MVC?
MVC is a software architectural pattern that separates an application into three main components: Model, View, and Controller.
Model represents the data and business logic of the application.
View is responsible for displaying the data to the user.
Controller handles user input, updates the model, and interacts with the view.
MVC promotes separation of concerns and improves code organization and maintainability.
Example: In a PHP web application, the model could be a class that in...read more
Q99. Array types and functions
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'];
Q100. What is an autoloader?
An autoloader is a function that automatically loads classes when they are needed in a PHP script.
Autoloaders eliminate the need to manually include class files.
They use naming conventions to locate and load class files.
Autoloaders can be registered using spl_autoload_register() function.
Composer provides a default autoloader for PHP projects.
Interview Questions of Similar Designations
Top Interview Questions for PHP Developer Related Skills
Interview experiences of popular companies
Calculate your in-hand salary
Confused about how your in-hand salary is calculated? Enter your annual salary (CTC) and get your in-hand salary
Reviews
Interviews
Salaries
Users/Month