PHP Interview Questions and Answers
PHP earlier stood for Personal Home Pages, but now it stands for Hypertext Pre-processor. PHP is a server-side scripting language that is used for building web pages and applications. We have just added more questions in our question bank for PHP interview questions. This language includes many Frameworks and CMS for creating large websites. Even a non-technical person can create web pages or apps using PHP CMS or frameworks. PHP supports various frameworks and CMS that are used to develop applications.
Before getting confused with the plethora of PHP developer interview questions, you need to ensure the basics. This question will help you to understand the core basics of PHP and make you even more confident enough to jump onto the advanced questions.
| Quick Facts About PHP | |
|---|---|
| What is the latest version of PHP? | 8.0.3, released on 4th March 2021 |
| Who is the developer of PHP? | Rasmus Lerdorf |
| What language does PHP use? | C language |
| PHP License | It is a BSD-style license which does not have the "copyleft" and restrictions associated with GPL. |
- It runs on various platforms, including Windows, Mac OS X, Linux, Unix, etc.
- It is compatible with almost all servers, including Apache and IIS.
- It supports many databases like MySQL, MongoDB, etc
- It is free, easy to learn and runs on the server-side.
- PHP can operate various file operations on the server
Note: This is a list of the most frequently asked PHP interview questions. Please have a good read and if you want to download it, it is available in a PDF format so that you can brush up your theoretical skills on this subject.
Top PHP Developer Interview Questions
You can use this SELECT MAX(salary) FROM employee WHERE Salary NOT IN ( SELECT Max(Salary) FROM employee); Query to find the 2nd highest salary of the employee.
It is used with the SELECT statement to restrict the number of rows in the result set. Limit accepts one or two arguments which are offset and count.
The syntax of limit is a
SELECT name, salary FROM employee LIMIT 1, 2
COUNT(*) is used to count the number of rows in the table.
SELECT COUNT(*) FROM BestPageTable;
MVC is an application in PHP which separates the application data and model from the view.
The full form of MVC is Model, View & Controller. The controller is used to interacting between the models and views.
Example: Laravel, YII, etc
It is an application package manager for the PHP programming language that provides a standard format for managing dependencies of PHP software. The composer is developed by Nils Adermann and Jordi Boggiano, who continue to lead the project. The composer is easy to use, and installation can be done through the command line.
It can be directly downloaded from https://getcomposer.org/download
Using the composer can solve the following problems:
- Resolution of dependency for PHP packages
- To keep all packages updated
- The solution is autoloading for PHP packages.
It is used to get the name and path of current page/file.
Namespace allows us to use the same function or class name in different parts of the same program without causing a name collision.
Namespace MyAPP;
function output() {
echo 'IOS!';
}
namespace MyNeWAPP;
function output(){
echo 'RSS!';
}
With the help of $_SERVER['HTTP_USER_AGENT']
$num = 12345;
$revnum = 0;
while ($num > 1)
{
$rem = $num % 10;
$revnum = ($revnum * 10) + $rem;
$num = ($num / 10);
}
echo "Reverse number of 12345 is: $revnum";
function getTableOfGivenNumber($number) {
for($i=1 ; $i<=10 ; $i++) {
echo $i*$number;
}
}
getTableOfGivenNumber(5);
Top 10 PHP Interview Questions
Here you will find the list of Top PHP interview questions, which were written under the supervision of industry experts. These are the most common questions and usually asked in every interview for the role of the PHP Developers.
- What are Design Patterns in PHP?
- What is the difference between abstract class & interface in PHP.
- What is traits & how it can we used?
- What is the use of .htaccess file?
- What is the difference between MyISAM and InnoDB?
- What is the difference between Public Private and Protected?
- What is Constructor and Destructor?
- What is final class and final method in PHP?
- What is a static member function?
- What is function Overloading and Overriding in PHP?