Top 50 PHP Interview Questions and Answers

Cookies in PHP are small text files that are stored on the user's computer to track and store information about the user's activities on a website.

• Cookies are used to remember user preferences and login information.

• They can be set, retrieved, and del...read more

The difference between $var and $$var is that $var is a variable with a fixed name, while $$var is a variable with a variable name.

• The $var variable is a regular variable with a fixed name, while $$var is a variable with a variable name.

• The $$var var...read more

GET and POST are HTTP methods used to send data to a server in PHP.

• GET method appends data to the URL as query parameters

• POST method sends data in the body of the HTTP request

• GET is less secure as data is visible in the URL

• POST is more secure as data...read more

Session in PHP allows to store user data on the server for later use.

• Session starts when a user logs in and ends when the user logs out or the session expires.

• Session data is stored on the server and identified by a unique session ID.

• Session variable...read more

To connect to MySQL database using PHP, create a Connection class.

• Use mysqli_connect() function to establish a connection

• Pass the database credentials as parameters to the function

• Create a constructor method to initialize the connection

• Create a query...read more

Using $$ in a variable in PHP creates a variable variable.

• It creates a new variable with the name of the value of the original variable.

• The new variable will contain the value of the original variable.

• It can be useful in certain situations, but can a...read more

PHP code can be written in Blade templates using the @php directive.

• Use the @php directive to write PHP code in Blade templates

• Wrap the PHP code in opening and closing PHP tags

• Use Blade syntax to output the result of the PHP code

• Example: @php echo 'H...read more

There are multiple ways to include files in PHP, such as include, require, include_once, and require_once.

• include: includes and evaluates a specified file

• require: includes and evaluates a specified file, but generates a fatal error if the file is not...read more

A PHP Developer should possess skills in PHP, frameworks, databases, version control, and problem-solving for effective web development.

• Proficiency in PHP: Understanding of PHP syntax, functions, and object-oriented programming.

• Framework Knowledge: F...read more

To post a form in PHP, use the method attribute in the form tag to specify 'POST' and set the action attribute to the PHP file that will process the form data.

• Create a form in HTML with method='POST' and action='process.php'

• Use input elements within ...read more

Action and filter hooks are mechanisms in WordPress that allow developers to modify or add functionality to a theme or plugin.

• Action hooks allow you to execute custom code at specific points in the WordPress execution process.

• Filter hooks allow you t...read more

Use PHP filters to validate form data and store in database.

• Use filter_input() function to validate input data.

• Sanitize data using filter_var() function.

• Connect to database and insert data using prepared statements.

• Handle errors and exceptions approp...read more

To upload a file in PHP, use the built-in function move_uploaded_file().

• Create a form with enctype='multipart/form-data'

• Use $_FILES['file']['name'] to get the name of the file

• Use $_FILES['file']['tmp_name'] to get the temporary location of the file

• Us...read more

To enable twig debug, set debug to true in the twig configuration file.

• Edit the development.services.yml file in the sites/default folder

• Set debug to true under the twig.config section

• Clear the cache to apply changes

Constants in PHP are identifiers whose value cannot be changed during the script's execution.

• Constants are defined using the define() function in PHP.

• Constants are case-sensitive by default.

• Constants can be accessed globally.

• Example: define('PI', 3.1...read more

PDO in PHP is a PHP Data Objects extension that provides a consistent interface for accessing databases.

• PDO stands for PHP Data Objects

• It is a database access layer providing a uniform method of access to multiple databases

• It is more secure than the ...read more

PHP array functions are built-in functions that allow manipulation of arrays in PHP.

• Some common array functions include array_push(), array_pop(), array_merge(), and array_filter().

• Array functions can be used to add or remove elements, merge arrays, ...read more

Implementing a hotel booking system like Oyo in PHP

• Use PHP frameworks like Laravel or CodeIgniter for efficient development

• Implement user authentication and authorization for secure access

• Create a database schema to store hotel details, room availabi...read more

Cookies and cache in a PHP application can be handled by setting and retrieving cookies, using caching mechanisms like memcached or Redis, and implementing cache control headers.

• Set cookies using setcookie() function in PHP

• Retrieve cookies using $_CO...read more

Some basic PHP functions include echo, strlen, substr, array_push, and file_get_contents.

• echo - outputs one or more strings

• strlen - returns the length of a string

• substr - returns a part of a string

• array_push - adds one or more elements to the end of ...read more

Session and cookies are used to store data in PHP, but session data is stored on the server while cookies are stored on the client's browser.

• Session data is stored on the server, while cookies are stored on the client's browser.

• Sessions are more secu...read more

Session management in PHP involves storing user data on the server to maintain state between multiple requests.

• Sessions are started using session_start() function in PHP.

• Session data is stored on the server and a unique session ID is sent to the clie...read more

Namespace in PHP is used to avoid naming conflicts between classes, functions, and variables.

• Namespace allows grouping of related classes, functions, and variables under a common name.

• It helps in organizing code and makes it easier to maintain.

• Namesp...read more

PHP session is a way to store user data on the server and maintain it across multiple pages.

• Session data is stored on the server and identified by a unique session ID.

• Session ID is usually stored in a cookie on the user's browser.

• Session data can be ...read more

Artisan is the command-line interface included with Laravel that provides a number of helpful commands for developers.

• Artisan is used to generate boilerplate code, run database migrations, and execute unit tests.

• Developers can also create their own c...read more

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 fai...read more

Session and cookie are used to store data in PHP. Session is stored on the server, while cookie is stored on the client's browser.

• Session data is stored on the server and is accessible across different pages of a website.

• Cookie data is stored on the ...read more