Top PHP Interview Questions in 2024

1. Explain the Session in PHP.
Sessions act as storage to store data on the server. It stays active until the user is active for a specified period, and once the user closes the browser, it will be inactive. In comparison with PHP cookies, sessions are secure and handle huge amounts of data. 

2. What is the major difference between the include() and require() functions?
Both functions are used in PHP to include external files in another PHP file. The difference lies in handling errors, where include() generates a warning and require() generates fatal errors. 

3. Define Public, Private, and Protected.

Public, private, and protected are the access specifiers in PHP.  

• Public Access Specifier: When a programmer specifies any variable or function as public in the program, that can be called from the instances of an object, another class, or from anywhere in the program. 
• Private Access Specifier: If any function or variable is specified as private, then those variables and functions can be accessed by that class only. 
• Private Access Specifier: Variables and functions can be accessed from the inherited and extended classes. But it cannot be accessed outside the class. 

4. What is the use of cURL?
cURL is the PHP library through which any URL can connect easily. 

5. Why do we need to use “action” and “enctype” attributes in an HTML form? 

The action attribute determines whether to send the form data in the form submission or not. The enctype determines how the form data should be encoded when submitting it to the server.

6. What does header() mean in PHP? 
It is used to send a raw HTTP header by using HTML tags or blank lines in a file.

7. Is PHP a case-sensitive scripting language?
Variables declared in PHP are case-sensitive, but their functions are not.

8. Why do we use count() and array() functions in PHP?
array() functions are used to check whether the value exists in an array or not, and count() is used to count all elements in an array or object.

9. What are the popular frameworks for PHP? 

• Laravel 
• CodeIgniter 
• Symphony 
• Yii 2 
• CakePHP 
• Zend Framework 

10. Which function is used to register a variable in a PHP session? 

We need to use the session_register() function. But first, we must set a value in $_SESSION Global to pass the username to the function.

11. Can you explain the rules of naming variables in PHP?

• First, while writing the code in PHP, one should always use the dollar symbol ($) before the variable. 
• Secondly, variables in PHP do not contain It does not include characters such as %, -, &, and +. 
• Thirdly, the variable must begin with a letter or underscore, and it should consist of numbers. 
• Lastly, PHP variables are case-sensitive. 

12. How do you define a Constant? 
By using the define() function directive, like define (“MYCONSTANT”,150).

13. How many loops are there in PHP?

There are four types of loops in PHP; those are: 

• for 
• while 
• do while 
• And foreach

14. How do you add a file to a PHP Page?
By using the “include()” and “require()” functions within the file path as its parameters.

15. How do we retrieve the data in the result set of MySQL using PHP?

By using the following SQL queries:

• mysql_fetch_row  
• mysql_fetch_array 
• mysql_fetch_object
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  Top PHP Interview Questions in 2024

  20 most frequently asked PHP interview questions in 2024. So, it is always a good idea to stay prepared with these PHP interview questions.