Interview questions for PHP Developer 6 months experience

Interview questions for PHP Developer 6 months experience: In this article, there is question with answer for good and well experienced developer which is mostly asked during the interview.

The PHP interview question include theory and also you will find practically explained which is helpful in understanding to every type of user.

PHP is among the top programming languages due to its capacity and it importance, easily understandable to make an enormous impact on results with only a small amount of code.

Due to simple with easiy to understand and efficiency has been a requirement over the last couple of years within the industry.

As a result businesses across the world-wide are investing significant amounts of money on hiring skilled PHP developers to fill the requirements and perform their jobs efficiently.

Below you will find some the best, mostly asked everytime and top-rated essential PHP interview questions can give you the edge needed to be able to answer the questions efficiently and respond with ease.

Best List of Interview questions for PHP Developer 6 months experience

PHP interview questions and answers for experienced

1.Main Difference of Function named include() and require()

Both of these include a particular file, but only one of them causes the process to terminate with a fatal error if the file cannot be included, whilst the include statement can still succeed and move on to the next stage of execution if the file cannot be included.

The include() statement and the require() statement fulfill the identical goals in the vast majority of situations. The primary difference is that the include() function causes an alert to be generated by PHP, but it permits script execution to continue even if the file that is supposed to be included cannot be located. At the same time, the require() statement causes a critical error, which ultimately results in the script being closed.

Code for Include:

// Fileone.php
	echo "The Fileone Sub file."; 
// CallFile.php
	//include Fileone.php file
	echo "The Fileone is included.";

2.What are the steps that need to be taken to obtain the client’s IP address?

Because there are a lot of different answers to choose from, this question could show you how dynamic and imaginative the candidate is. The simplest answer to this problem is to use the $_SERVER[“REMOTE ADDR”]; command, but the applicant is also allowed to write x-line code.

3.How are unset() and unlink() different from each other?

The unset() function changes a variable’s value to “undefined,” while the unlink() function deletes a file from the file system

4.What does the code below give you?:
$l = ‘1’;
$m = &$l;
$m = “2$m”;
echo $l.”, “.$m;

5.What are the main types of errors in PHP, and how do they differ from each other?

There are three main kinds of errors in PHP:

  • Notices – are simple, non-critical mistakes that happen while the script is running. Accessing a variable that hasn’t been set up yet is an example of a Notice.
  • Warnings – are errors that are more important than Notices, but the scripts keep running. Include() a file that doesn’t exist is one example.
  • Fatal – When a fatal error happens, the script stops running. A Fatal error would be if you tried to access a property of an object that doesn’t exist or if you tried to require() a file that doesn’t exist.

Understanding the different kinds of errors is very important because it helps developers know what’s going on during development and what to look out for when debugging.

6.What’s the difference between the GET and POST requests?

  • GET shows the provided data as part of the URL, whereas POST encrypts this information in the request and hides it from view.
  • GET can accommodate up to 2048 characters, but POST has no such limitations.
  • GET only accepts ASCII data, but POST has no constraints and even accepts binary data.
  • GET is typically used to get data, while POST is used to insert and update data.

Knowing the basic concepts of the HTTP protocol is crucial for a PHP developer, and the distinctions between GET and POST are crucial to this understanding.

7.What are the steps to take in order to enable error reporting in PHP?

You can either check the php.ini configuration file to see if “display errors” is set to “on” or declare “ini set(‘display errors’, 1)” in your script.
Then, while the script is being run, make sure to include the “error_reporting(E_ALL)” instruction in your code. This will cause any and all error messages to be displayed.

Enabling error messages is helpful while debugging because it shows the particular line that caused the error and if the script is performing appropriately.

8.What do Traits mean?
Traits are a way to make code that can be used more than once in languages like PHP that don’t support multiple inheritance. Traits can’t be used on their own.

It’s essential for a coder to understand the powerful aspects of the language he or she is trying to work on. Trait is one of these parts.

PHP interview questions and answers for freshers

9.Can a constant’s value change while the script is running?
No, once a constant is declared during PHP execution, its value can’t be changed.

10.Is it possible to extend a class that has been defined as Final?
No, you cannot extend a class that has the Final modifier applied to it. When a class or method is declared as final, overrides from child classes or methods are not allowed.

11.Is PHP a scripting language that cares about case-sensitive?
Yes and no are both right answers. Variables and how they are declared in PHP care about case, but function names don’t.

For example, user-defined functions in PHP can be written in all capital letters, but they can be used in lowercase later and still work.

12.Does PHP allow typecasting?

Yes, PHP does support typecasting, and it is easy to do. The types that can be cast in PHP are as follows:

(int), (integer): Cast to integer
(bool), (boolean): Cast to boolean
(float), (double),: Cast to float
(string): Cast to string
(array): Cast to array
(object): Cast to object

13.Can a PHP form be sent without using a “submit” button?
Yes, you can send in a form without pressing a button. Using the JavaScript submit() function makes this easy to do.

Advanced PHP interview questions

14.What do the session_start() and session_destroy() functions do?

Using PHP’s session_start() function, a new session can be started. But if a session is stopped, it can also pick up where it left off. In this case, if the session is resumed, the return will be the current session.



Most of the time, the session destroy() function is used to get rid of all the session variables.


15.In PHP, how do you open a file?
PHP lets users do things with files by giving them a lot of functions that deal with files.

When a file needs to be opened, the fopen() function is used. This function can open either a file or a URL, depending on what is needed. It needs $filename and $mode as arguments.


resource fopen ( string $filename , string $mode [, bool $use_include_path = false [, resource $context ]] )

16.What are the many ways that the explode() and implode() functions can be used?

The explode() function is used to break a string into an array, and the implode() function is used to produce a string by combining the contents of an array. Both of these functions may be found in the standard C library.

Sample code:
$strVar = "I love coding";
print_r (explode(" ",$strVar));
$strarvar = array('table','chair','glass');
echo implode(" ",$strarvar);

17.In PHP, which function do you use to determine the data type of any variable?

The answer is that you can check the data type of any variable by using the gettype() method.

Sample code:
echo gettype(true).''; //boolean
echo gettype(10).''; //integer
echo gettype('Programing language').''; //string
echo gettype(null).''; //NULL

18.What are some ways in which the maximum amount of time that a PHP script can be executed?

To answer your question, in order to increase the maximume_execution_time, you will need to modify the value of the max execution time declaration found in the php.ini file.

For instance, if you want to limit the maximum amount of time an execution can take to 120 seconds, you would change the value to:

maximume_execution_time = 120

Interview questions for PHP Developer 3 year experience

19.What does it mean in PHP to “pass the variable by value and reference”?

It is called “pass variable by value” when the value of the variable is passed.

In this case, even if the passed variable changes, the main variable stays the same.

Sample code:
function check($l) {

echo $k;

It is referred to as “pass variable by reference” whenever the variable is passed on in the form of a reference. In this case, the memory address for the main variable and the passed variable are the same, and the ampersand (&) is utilised for reference purposes.

Therefore, if we adjust one variable, we may expect the other to follow suit.

Sample code:
function check(&amp;$t) {
echo $t;

20.Describe the process of type casting as well as type juggling.

It is referred to as “typecasting,” and it is the process by which PHP can assign a certain data type to any variable. Before each variable, the type of variable that is necessary to be used is specified within parentheses.

Sample code:
$strvar = "10"; // $strvar is now string
$boolvar = (boolean) $strvar; // $boolvar is now boolean

PHP does not provide datatype for variable declaration. The process of automatically changing the type of a variable based on the value that has been set to it is known as “type juggling.”

Sample code:
$valvar = 5; // $valvar is now number
$valvar = "500" //$valvar is now string

21.How can you use PHP to connect to a MySQL server?

Answer: If you want to connect to the MySQL server using the mysqli_connect() method or by declaring a database object of the mysqli class, you have to give the hostname, username, and password for MySQL.

Sample code:
$mysqlivar = mysqli_connect("localhostval","usernameval","passwordval");
$mysqlivar = new mysqli("localhostval","usernameval","passwordval");

22.Which PHP function is used to count the total number of rows that a query returns?

Answer:Use the mysqli_num_rows() function to find out how many rows were returned by the query.

Sample code:
$mysqlivar = mysqli_connect("hostnameval","usernameval","passwordval","DBnameval");
$resultvar=mysqli_query($mysqlivar,"select * from students");

23.What does the imagetypes() method do?

Answer: The image types() function gives back a list of the images that the installed version of PHP can handle. You can use this function to find out if PHP can handle a certain image extension or not.

Sample code:
//Determine whether or not the BMP extension is supported by PHP.
if (imagetypes() &amp;IMG_BMP) {
    echo "BMP extension enabled";

24.In order to delete a file, which function in PHP do you use?

The PHP unlink() method is what’s needed to get rid of any file.

Sample code:

25.What is the function strip tags() used for?

Answer: The strip tags() function is used to extract a string from a text while removing HTML, XML, and PHP tags. This function has one required and one optional parameter. The optional argument allows you to accept specific tags.

Code example:
//Get rid of all tags from the text
echo strip_tags("<b>Laravel</b> is a best <em>programming</em> language");
//Get rid of all tags except <b> tag
echo strip_tags("<b>Laravel</b> is a best <em>programming</em> language","<b>");


It is my sincere goal that reading this post would help you feel more prepared to tackle any PHP interview. Do not hesitate to get in touch with us and provide any missing PHP Interview questions that you were asked during an interview.

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