Top 10 PHP Developer Interview Questions

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This question helps employers understand how independent you are as a developer. They want to know that you can work independently and still produce quality results for their company. Use your answer to highlight your ability to complete tasks on time, meet deadlines and manage projects effectively. Learn what skills and qualities interviewers are looking for from a senior PHP developer, what questions you can expect, and how you should go about answering them.

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PHP is a loosely typed language and we do not require to declare the data types of variables, rather PHP assumes it automatically by analyzing the values. It is a server-side scripting language used to design dynamic websites or web applications. As such, getting an industry-standard PHP development training will steer you in the right direction.

To concatenate two string variables together, use the dot (.) operator. The HTTP header will be different from the actual header where we send Content-Type as text/html\n\n. In this case content type will be application/octet-stream and actual file name will be concatenated alongwith it. For example,if you want make a FileName file downloadable from a given link then its syntax will be as follows. One of the environemnt variables set by PHP is HTTP_USER_AGENT which identifies the user’s browser and operating system.

Explain PHP data types

Offering an interface between the server and the end-user. PHP can generate JavaScript code meant to be executed by the browser. POST, on the other hand, allows ASCII, binary data, as well as other forms of data. Explain the difference between indexed and associative array. Describe the troubleshooting process you follow when a program doesn’t run properly. What features would you develop to increase user experience quality?

  • Once done with the test, the developer candidates will have an interview with a senior PHP developer or a team leader from your organization.
  • There is no need to write a dollar sign ($) before a constant, where as in Variable one has to write a dollar sign.
  • PHP provides various functions to read data from the file.
  • As indicated by the name, this function will return the value of the constant.
  • Further you can go through your past assignments you have done with the subject and make sure you are able to speak confidently on them.
  • We’ve divided these questions into basic, intermediate, and advanced PHP interview questions.

Whitespace is the stuff you type that is typically invisible on the screen, including spaces, tabs, and carriage returns (end-of-line characters). Session_id() function returns the session id for the current session. GD library is needed to be able to execute image functions.

Are Parent constructors called implicitly inside a class constructor?

Its simplest function mysql_close PHP provides to close a database connection. This function takes connection resource returned by mysql_connect function. The date() function returns a formatted string representing a date. You can exercise an enormous amount of control over the format that date() returns with a string argument that you must pass to it. PHP’s time() function gives you all the information that you need about the current date and time.

PHP developer interview questions

The job interview process can be confusing especially for companies with less experience in software development. Each candidate will present themselves as the ones with the best PHP skills. Version control systems are a common tool used by developers to keep track of changes made to code. This question allows you to demonstrate your knowledge and experience with this important aspect of the job.

How can we get IP address of a client in PHP?

To do this, I use a combination of automated and manual testing methods. Automated tests allow me to quickly identify any potential issues with the code, while manual tests help me verify that everything works as expected. I also take advantage of tools such as debugging software to help find and fix any bugs or errors in the code. This question can help the interviewer understand your commitment to professional development. Highlight how you stay up-to-date with industry trends and developments, including new PHP versions and web frameworks.

Using getTraceAsString() method of Exception class which returns formated string of trace. Using getCode() method of Exception class which returns the code of exception. These are more Middle PHP developer job serious errors — for example, attempting to include() a file that does not exist. By default, these errors are displayed to the user, but they do not result in script termination.

These were some of the common PHP interview questions that hiring companies are most likely to ask during their interview process. Runtime exceptions occur during the execution of code and are caused by unexpected events, such as attempting to access an array index that does not exist. We add a set_time_limit at the start of a script to make the time of execution infinite.

How is it possible to set an infinite execution time for PHP script?

That is why you cannot change the content after running the script. On the other hand, while running dynamic websites’ scripts, the script is changeable. As a result, every time a user visits the site, the contents get regenerated.

PHP developer interview questions

If you aspire to be a PHP developer, you’ll need to know it thoroughly. Here, we’ve made a collection of the top PHP interview questions and answers to help you. We’ve divided these questions into basic, intermediate, and advanced PHP interview questions. PHP can be quite tricky, therefore you need candidates with a solid technical background and excellent coding skills. Use these questions to determine your candidates’ levels of experience and knowledge and shortlist those who match your specific criteria. You can include an assignment to compliment your hiring process and better evaluate your candidates’ skills.

Ifhelloistrue, then the function must printhello, but if the function doesn’t receivehelloorhelloisfalsethe function must printbye. Understanding of arrays and array related helper functions is important for any PHP developer. Traits are a mechanism that allows you to create reusable code in languages like PHP where multiple inheritance is not supported.

The foreach loop though iterates over an array of elements, the execution is simplified and finish the loop in less time comparing with for loop. The count() function in PHP is used to count the number of elements present in the array. The function might return 0 for the variable that has been set to an empty array.

PHP is a programming language whereas ASP.NET is a programming framework. Websites developed by ASP.NET may use C#, but also other languages such as J#. ASP.NET is designed for windows machines, whereas PHP is platform free and typically runs on Linux servers. Its content is regenerated every time a user visits or reloads. A Data Science Enthusiast with in-hand skills in programming languages such as Java & Python. A Data Science Enthusiast with in-hand skills in programming languages such as…

PHP developer interview questions

Sessions automatically end when the PHP script finishes executing but can be manually ended using the session_write_close(). The use of the function session_start() lets us activating a session. Hence, hashing passwords with these algorithms can create vulnerability. The addslashes function enables us to escape data before storage into the database. If we want to check whether a variable has a value or not, it is possible to use the empty() function. It is possible to use the dedicated function, ctype_alnum to check whether it is an alphanumeric value or not.

This single scope spans included and required files as well. If there are any errors, then the require() function produces a warning and a fatal error and stops the script. A session creates a file in a temporary directory on the server where registered session variables and their session id are stored. This data will be available to all pages on the site amid that visit.

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