Core Php Interview Questions
Core PHP Interview Questions: Ace Your Next Interview!
Core Php Interview Questions
Core PHP is an open-source server-side scripting language used for creating dynamic web pages and applications. It is widely used by web developers and has a large community support. Core PHP Interview questions typically cover topics such as basic syntax, data types, control structures, functions, file handling, and object-oriented programming concepts. Other areas commonly explored include database connectivity, security measures, and error handling. Interviewers also evaluate candidates' knowledge of various frameworks and best practices for efficient PHP development. A solid understanding of Core PHP is essential for any web development role and candidates are expected to have a strong grasp of the language's fundamentals and its implementation in real-world applications.
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1 - What are the different data types in PHP?
PHP supports several data types such as string, integer, float, Boolean, array, object, resource, NULL, and callable.
2) What are the differences between single quoted and double quoted strings in PHP?
Single quoted strings do not parse variables or special characters, while double quoted strings do. Double quoted strings also allow for escape sequences like \n (newline) and \t (tab).
3) What are PHP constants and how are they different from variables?
Constants keep their value throughout the entire execution of the script and cannot be redefined or changed once they are set, while variables can be changed during the script execution.
4) Explain the differences between GET and POST methods in PHP.
GET method sends data through the URL while POST sends data in the HTTP body. GET is less secure and has a limitation on the amount of data it can send, while POST has no limitations and is more secure.
5) How can you prevent SQL injection attacks in PHP?
To prevent SQL injection attacks, developers should use prepared statements with parameterized queries, sanitize user input, and limit the privileges of the database user.
6) What is the difference between include and require in PHP?
Include and require both insert code from another PHP file, but require will produce a fatal error if the file cannot be found or included, while include will only produce a warning.
7) How do you handle errors in PHP?
PHP has built in error reporting functions like error_reporting() and display_errors() to handle errors. Developers can also use try catch blocks for handling exceptions.
8) Explain the difference between classes and objects in PHP.
Classes are blueprints or templates for creating objects. Objects are instances of a class and can hold its own set of properties and methods.
9) What is the use of the “final” keyword in PHP?
The “final” keyword can be used to prevent a class or method from being overridden by a subclass.
10) How can you unset a session in PHP?
The session_unset() function can be used to remove all session variables, while session_destroy() can be used to destroy the session completely.
11) What is the use of htmlentities() function in PHP?
The htmlentities() function converts special characters to their corresponding HTML entities, preventing cross site scripting attacks.
12) How do you upload files in PHP?
PHP has built in functions for handling file uploads such as move_uploaded_file() and is_uploaded_file().
13) Can you explain the concept of routing in PHP?
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Routing is the process of mapping URLs to specific PHP code, allowing a user to access different pages or functions on a website.
14) What are namespaces in PHP?
Namespaces help to organize code and prevent naming conflicts by providing a way to group related classes, interfaces, and functions under a given namespace.
15) Differentiate between require_once and require in PHP.
require_once checks if the file has already been included and if so, does not include it again, while require includes the file every time it is called, potentially causing errors.
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