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Interview Questions & Answer

1) What is PHP?

PHP is a web language based on scripts that allow developers to dynamically create generated web pages. PHP means PHP: Hypertext Preprocessor.

2) Which programming language does PHP resemble?

PHP syntax resembles Perl and C.

3) List down the common uses of PHP?

• PHP performs system functions, i.e. from files on a system it can create, open, read, write, and close them.
• One can add, delete, modify elements within your database with the help of PHP.
• Access cookies variables and set cookies.
• PHP can handle forms, i.e. gather data from files, save data to a file, through email you can send data, return data to the user.
• Using PHP, you can restrict users to access some pages of your website and also encrypt data.

4) How do you execute a PHP script from the command line?

We just need to use the PHP command line interface (CLI) and specify the file name of the script to be executed as follows:

php script.php

5) What’s the difference between unset() and unlink()

unset() sets a variable to “undefined” on the other hand unlink() deletes a file we pass to it from the file system.

6) How can I display text with a PHP script?

with the help of two methods one can display text with PHP script

:

7) How can you enable error reporting in PHP?

Check if “display_errors” is equal “on” in the php.ini or declare “ini_set('display_errors', 1)” in your script.
Then, include “error_reporting(E_ALL)” in your code to display all types of error messages during the script execution.

Enabling error messages is quite important especially during the debugging process. As one can instantly get the exact line that is producing the error and can see also if the script in general is behaving correctly

8) What are the two most common ways to start and finish a PHP block of code?

The two most common ways to start and finish a PHP block of code are

9) How to create a mysql connection?

mysql_connect(servername,username,password);

10) How to execute a sql query? How to fetch its result?

$my_qry = mysql_query(“SELECT * FROM `users` WHERE `u_id`=’1′; “); 
$result = mysql_fetch_array($my_qry);
echo $result[‘First_name’];

11) Write a program using while loop?

$my_qry = mysql_query(“SELECT * FROM `users` WHERE `u_id`=’1′; “); 
while($result = mysql_fetch_array($my_qry))
{
echo $result[‘First_name’.].”
”;
}

12) Explain the difference between PHP4 and PHP5.

PHP4 doesn't support oops concept and uses Zend Engine 1.

PHP5 supports oops concept and uses Zend Engine 2.

13) Describe MVC?

MVC(Model-View-Controller) - is a software architecture pattern for designing and developing web application. It divides the web application in 3 segments Model, View and Controller.

• Model – it represents application data domain. It contains real world objects and supplies data to view.
• View -it represents user interface of the application. It is related to look and feel of the data by the user.
• Controller -it responds to user's requests by loading appropriate model and view.

Blog

PHP is a server-side scripting language which is designed for web development

? PHP powers everything from blogs to the most popular websites in the world

More about PHP

• PHP stands for Hypertext Preprocessor
• PHP code may be embedded into HTML code
• PHP is used as a server-side language
• PHP is free, fast, flexible and pragmatic

Where is PHP used

• The world's largest social network, Facebook uses PHP
• The world's largest content management system, Wordpress runs on PHP
• Many developers use PHP as a server-side language
• PHP is simple. Hence, many beginners use it.

Why PHP

• PHP is secure
• PHP runs on many operating systems like Windows, Mac OS, Linux, etc.
• PHP is supported by many servers like Apache, IIS, Lighttpd, etc.
• PHP supports many database systems like MYSQL, Mango DB, etc.
• PHP is free

The power of PHP

• PHP can serve dynamic web pages
• PHP can also collect, validate, save form data
• PHP can add, modify, delete data in the database
• PHP can handle sessions and cookies
• PHP can read, write, delete files on the server
• PHP can serve Images, PDFs, Flash Movies and more file types
• PHP can resize, compress, edit images

About the PHP Language

PHP Language is a human-readable programming language which can easily be learned. The below code will output "Hello World"

echo "Hello World";

?>

Why Should I Learn PHP?

• PHP is beginner-friendly. If you are a beginner, you can understand PHP without much effort.
• PHP is one of the highest paid programming languages.
• PHP is scalable.
• PHP has a large community to get help from.
• PHP is easy to install and get started with

Why use a PHP framework?

A PHP framework provides a basic structure for streaming the development of web apps. We use them because they speed up the development process.

The top 10 PHP frameworks

Laravel

Codelgniter

Symfony

Cakephp

Yii

Zend framework

Phalcon

Fuel php

PHPixie

Slim

Which framework is right for you?

Using PHP frameworks simplifies the development process which helps to minimize work load. Every framework has its own strength and weaknesses. They all vary in terms of community, documentation and the database they support. The decision on the best framework depends on various factors like security, ease of use, scalability, documentation and many more. So, you need to start by understanding the requirements of the project or application you want to develop