PHP Interview Questions And Answers

PHP Interview Questions For Freshers

Let us start by answering a few PHP interview questions for freshers which are suitable for new college graduates or professionals without extensive professional experience with the scripting language:

In PHP, you can change a variable's value throughout the course of execution. PHP variables make the usage of the $ sign compulsory at the start. Developers can define them with a simple assessment. Moreover, the default scope for a variable in PHP is the current access scope.

On the other hand, you cannot change the value of a PHP constant during the course of script execution. Unlike the variables, constants do not require the use of the $ sign in the beginning. PHP developers cannot define constants through simple assessments. They need the define() function to do so. Also, you can access constants throughout PHP without the need for scoping rules.

In PHP, a session refers to the way of storing information developers use across different pages of a website being built. Unlike cookies, this information is not stored on the user’s computer. A file is created in the temporary directory on the PHP server by the session. This is where you can store the registered sessions and their variables.

In PHP, PEAR stands for PHP Extension and Application Repository. It is a dedicated framework and repository for reusable components. PEAR facilitates higher programming levels for web developers. It comprises different PHP code snippets and libraries and gives you a command-line interface to install packages automatically.

It is safe to say that PHP is a partially case-sensitive scripting language. While the variable names here are fully case-sensitive, the function names are not so. User-defined functions in PHP are also not case-sensitive despite the rest of the language being case-sensitive.

Here are the rules you should follow while naming a PHP variable:

  • The variable must begin with the $ symbol, followed by its variable name
  • All variable names should begin with an underscore or a letter
  • The name may contain letters, underscores, and numbers without characters like +, -, %, etc.
  • You cannot add spaces in the name of a PHP variable
  • Being case-sensitive in nature, note that $NAME and $name are treated as two different variables

While PHP comes with a bunch of benefits, here are a few major drawbacks of working with the scripting language:

  • PHP is not the best option for building large-scale content-based applications
  • It is not the most secure option out there because of being open-source
  • PHP does not allow any change in your online application’s core behavior
  • Using too many tools and features of PHP may lead to poor application performance over time
  • PHP is often criticized for its relatively poor error handling as compared to other scripting languages

Advanced PHP Interview Questions

Let us now have a look at some advanced PHP interview questions suitable for experienced IT professionals:

PHP scripts are capable of generating HTML, making it possible to pass information from HTML to PHP. While PHP is a server-side language, HTML is client-side. You can, therefore, execute PHP on the server side to obtain results as objects, strings, arrays, etc., and use the same to display values in HTML.

The @ symbol in PHP is used to suppress error messages. In the case of any runtime error occurring on the line containing the @ symbol at the start, PHP will handle that error effectively.

In PHP, a parser refers to the software capable of converting source code into code your computer can understand. Whatever instructions a developer gives to their computer as a PHP code gets converted into a format readable by the machine by the parser.

There are three major types of errors in PHP as follows:

  • Notices - Notices refer to non-critical errors occurring during script execution. These errors are not visible to users.
  • Warnings - These PHP errors are more critical than notices. They do not interrupt script execution and are visible to the users.
  • Fatal - Finally, these are the most critical PHP errors that are capable of immediately terminating your script execution.

In PHP, traits are nothing but mechanisms that help you create reusable code in PHP as well as other scripting languages that do not support multiple inheritances. It is not possible for these traits to instantiate on their own. Traits help you reduce the limitations associated with a single inheritance by letting you reuse methods in multiple independent classes located in different className hierarchies.

In PHP, the crypt() function is the most commonly used method for hashing passwords. This is because it provides you with several hashing algorithms capable of being used, including md5, sha1, sha256, etc., all of which are built to ensure the speed and efficiency of your applications.

Cookies refer to small records installed by a server on a user’s/client’s computer. They are responsible for storing data related to the concerned user on their browser. Cookies are often used to identify specific users and are embedded on their computers as they request specific pages. Whenever a computer requests a page with a program, it will send cookies as well.

In PHP, you can create cookies with the help of the setcookie() function. In this function, the “name” is compulsory and other parameters like value, path, secure, domain, etc. are optional.

Frequently Asked Questions

How relevant is PHP in the modern world of software development?

PHP has stayed relevant in the modern world of software development because of its ability to create dynamic content and interact effectively with multiple databases. Developers and organizations all over the world are attracted to PHP for its simplicity, flexibility, scalability, and efficiency.

Which are the top companies using PHP for programming?

The remote angular developers are responsible for building UI applications. The engineers use this framework to design the Graphical User Interface of complex web applications and websites. Apply to Company Bench for angular freelance jobs if you have experience creating GUI. Top Indian companies are looking to hire you.

Here are some of the most prominent names in the IT industry who have hired PHP developers for core programming:

  • Etsy
  • WordPress
  • Slack
  • MailChimp
  • Facebook
  • Yahoo!
  • Tumblr
  • Wikipedia

What is the average salary of a PHP developer in India?

The average annual salary of a PHP developer in India is around ₹3 lacs. A skilled PHP developer can earn anywhere between ₹1.1 lacs and ₹6 lacs on an annual basis.

Is PHP developer a sustainable career option?

Looking at the number of companies and websites using PHP for programming, it is safe to say that PHP developer is a sustainable career option. If you are skilled and competent, it can open doors to lucrative job opportunities at some of the biggest names in the global IT sector.

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