1.
What is the use of ini_set()?
Sign in to unlock
Get unlimited access to all questions and answers
Get lifetime access
Track progress
Save time
The fastest way to prepare
for a tech interview
Check our curated list of full-stack, data structures & software architecture interview questions and answers for developers
Web & Mobile dev Web & Mobile dev
Data structures & Algorithms Data structures
Software Architecture Design patterns
ADO.NET
Android
Angular AngularJS ASP.NET ASP.NET MVC ASP.NET Web API
C#
CSS
DevOps
Entity Framework
Flutter
Git
Golang
GraphQL
HTML5
Ionic
Java
JavaScript
jQuery
Kotlin
Laravel
LINQ
MongoDB .NET Core
Node.js
OOP
PHP
PWA
Python
React
React Native
Reactive Programming
Redis
Redux
Ruby
Ruby on Rails
Testing
Spring
SQL
T-SQL
TypeScript
UX Design
Vue.js
WCF
Web Security
WebSockets
Xamarin PHP interview questions.
Only challenges
- 2.
What is the difference between == and ===?
Answer:
- 3.
What is the return type of a function that doesn't return anything?
Answer:
- 4.
What does $GLOBALS mean?
Answer:
- 5.
What are the keys & values in an indexed array?
Answer:
- 6.
What is the purpose of php.ini file?
Answer:
- 7.
How can you pass a variable by reference?
Answer:
- 8.
Is multiple inheritance supported in PHP?
Answer:
- 9.
What is stdClass in PHP?
Answer:
- 10.
In PHP, objects are they passed by value or by reference?
Answer:
- 11.
What is PDO in PHP?
Answer:
- 12.
Is there a difference between isset and !empty?
Answer:
- 13.
Differentiate between echo and print()
Answer:
- 14.
What is the differences between $a != $b and $a !== $b?
Answer:
- 15.
What does the 'var' keyword mean in PHP?
Answer:
- 16.
What do we mean by keys and values?
Answer:
- 17.
What are the differences between die() and exit() functions in PHP?
Answer:
- 18.
Explain what the different PHP errors are
Answer:
- 19.
Explain usage of enumerations in PHP
Answer:
- 20.
Explain how we handle exceptions in PHP?
Answer:
- 21.
What are the main differences between const vs define
Answer:
- 22.
What's the difference between isset() and array_key_exists()?
Answer:
- 23.
Can you extend a Final defined class?
Answer:
- 24.
What are PSRs? Choose 1 and briefly describe it.
Answer:
- 25.
How can you enable error reporting in PHP?
Answer:
- 26.
When should I use require vs. include?
Answer:
- 27.
What are the different scopes of variables?
Answer:
- 28.
What is the difference between var_dump() and print_r()?
Answer:
- 29.
What is the difference between single-quoted and double-quoted strings in PHP?
Answer:
- 30.
How is it possible to set an infinite execution time for PHP script?
Answer:
- 31.
Give me some real life examples when you had to use __destruct in your classes
Answer:
- 32.
Declare some function with default parameter
Answer:
- 33.
PHP array delete by value (not key)
Answer:
- 34.
Is there a function to make a copy of a PHP array to another?
Answer:
- 35.
Explain the difference between exec() vs system() vs passthru()?
Answer:
- 36.
Are Parent constructors called implicitly inside a class constructor?
Answer:
- 37.
Maximum how many arguments are allowed in a function in PHP?
Answer:
- 38.
What is the difference between PDO's query() vs execute()?
Answer:
- 39.
Explain the difference between shell_exec() and exec()
Answer:
- 40.
What is the difference between a PHP interpreter and a PHP handler?
Answer:
- 41.
Differentiate between exception and error
Answer:
- 42.
What exactly is the the difference between array_map, array_walk and array_filter?
Answer:
- 43.
What are the exception class functions?
Answer:
- 44.
What are some of the big changes PHP has gone through in the past few years?
Answer:
- 45.
Differentiate between parameterised and non parameterised functions
Answer:
- 46.
Why do we use extract()?
Answer:
- 47.
Explain function call by reference
Answer:
- 48.
What is the difference between using self and $this?
Answer:
- 49.
What is use of Null Coalesce Operator?
Answer:
- 50.
Does PHP support method overloading?
Answer:
- 51.
What is the difference between MySQL, MySQLi and PDO?
Answer:
- 52.
What is autoloading classes in PHP?
Answer:
- 53.
When should I use require_once vs. require?
Answer:
- 54.
Is there any reason to use strcmp() for strings comparison?
Answer:
- 55.
What will be returned by this code? Explain the result.
Answer:
- 56.
How do I pass variables and data from PHP to JavaScript?
Answer:
- 57.
Let's create Enumerations for PHP. Prove some code examples.
Answer:
- 58.
How would you create a Singleton class using PHP?
Answer:
- 59.
What does the following code output?
Answer:
- 60.
What will be returned by this code?
Answer:
- 61.
Check if PHP array is associative
Answer:
- 62.
Compare mysqli or PDO - what are the pros and cons?
Answer:
- 63.
Store an array as JSON or as a PHP serialized array?
Answer:
- 64.
What are the disadvantages of using persistent connection in PDO?
Answer:
- 65.
What exactly are late static bindings in PHP?
Answer:
- 66.
Explain the Exception Hierarchy introduced in PHP7
Answer:
- 67.
explain what is a closure in PHP and why does it use the “use” identifier?
Answer:
- 68.
What is use of Spaceship Operator?
Answer:
- 69.
What is the best method to merge two PHP objects?
Answer:
- 70.
Is PHP single or multi threaded?
Answer:
- 71.
How to turn errors into exceptions in PHP?
Answer:
- 72.
What does $$ mean?
Answer:
- 73.
What is the crucial difference between using traits versus interfaces?
Answer:
- 74.
What does yield mean in PHP?
Answer:
- 75.
What's better at freeing memory with PHP: unset() or $var = null?
Answer:
- 76.
Does PHP have threading?
Answer:
- 77.
Are PDO prepared statements sufficient to prevent SQL injection?
Answer:
- 78.
Explain the Order of Precedence for Traits in PHP
Answer:
- 79.
What does a $$$ mean in PHP?
Answer:
- 80.
How to measure execution times of PHP scripts?
Answer:
- 81.
How could we implement method overloading in PHP?
Answer:
- 82.
Provide some ways to mimic multiple constructors in PHP
Answer:
One tip that got me hired by Google, Microsoft, and Stripe
I've worked for Microsoft, Google, Stripe, and received offers from many other companies. One thing I learned when I was interviewing myself is that standard interview tips are woefully inadequate.
Reverse Tech Interview: Questions to Stump an Interviewer
Few people want to get into an uncomfortable environment or an unprofitable company with no prospects. If you’re wondering how to get a real feel for a company during an interview, you’re welcome. I’ll give a list of questions that interviewers don’t usually expect...
How to become a programmer, move to the US, and get a dream job
Are you curious about what you need to do to earn more than $15.000 a month, drive a Tesla, live in sunny California, and work at Google, Apple, Facebook, or Amazon?
11 Reactive Systems interview questions and answers for software engineers Reactive Systems
Reactive systems are an architectural style that allows multiple individual applications to blend into one unit, reacting to their environment, while staying aware of each other. Here is a list of coding interview questions on Reactive Systems to help you get ready for your next data struc...
Reactive Systems
34 Microservices interview questions and answers for software engineers Microservices
Microservice architecture – a variant of the service-oriented architecture structural style – arranges an application as a collection of loosely coupled services. In a microservices architecture, services are fine-grained and the protocols are lightweight. Here is a list of coding intervie...
Microservices
7 Layering & Middleware interview questions for developers Layering & Middleware
Middleware in the context of distributed applications is software that provides services beyond those provided by the operating system to enable the various components of a distributed system to communicate and manage data. Middleware supports and simplifies complex distributed application...
Layering & Middleware
55 Docker interview questions and answers for software engineers Docker
Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Here is a list of coding interview questions on Docker to help you get ready for your next data structures interview in 2021.
Docker
23 Databases interview questions and answers for software engineers Databases
A database is an organized collection of data, generally stored and accessed electronically from a computer system. Where databases are more complex they are often developed using formal design and modeling techniques. Here is a list of coding interview questions on Databases to help you g...
Databases
21 Concurrency interview questions and answers for software engineers Concurrency
In computer science, concurrency is the ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the final outcome. Here is a list of coding interview questions on Concurrency to help you get ready for your n...
Concurrency
13 CAP Theorem interview questions and answers for software engineers CAP Theorem
In theoretical computer science, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer, states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees: Consistency: Every read receives the ...
CAP Theorem
Load more posts
Features
Access all answers
Get the inside track on what to expect in your next tech interview. We offer you a collection of high quality technical interview questions to help you prepare for your next coding interview.
Track progress
A smart interface helps you track your progress and focus on the topics you need. You can search through questions or sort them by difficulty or type.
Save time
Save tens of hours searching for information on hundreds of low-quality sites designed to drive traffic and make money from advertising.
Land a six-figure job at one of the top companies.
Prepare for a technical interview
Get hired with our
tech interview questions & answers
