Top 15 PHP Interview Questions You Must Prepare in 2023

PHP is a recursive acronym that stands for PHP Hypertext Preprocessor. It's a widely used open-source programming language for creating dynamic web pages and mobile APIs. So, if you're thinking about starting a career in PHP and want to learn the necessary abilities, now is the time to do so. After speaking with PHP Certification Training specialists, these PHP Interview Questions and Answers were compiled.

1. In PHP, what is PEAR?

PEAR is a framework and repository for reusable PHP components. The abbreviation for PHP Extension and Application Repository (PEAR) is PHP Extension and Application Repository. It's full of PHP code snippets and libraries of all kinds. It also has a command-line interface for automatically installing "packages."

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2. Is PHP a language that cares about the case?

PHP is case-sensitive to some extent. The case of variable names matters, whereas the case of function names does not. If you use lowercase for the function name and uppercase for the call, it will still work. The rest of the language is case-sensitive, even though user-defined functions are not.

3. What does it mean to 'escape to PHP'?

The PHP parsing engine needs a way to tell PHP code apart from other page elements. This is accomplished by using the 'Escape to PHP' technique. When you escape a string, the amount of ambiguity in the quotations you use is reduced.

4. In PHP, how do you define a constant?

To define a constant, you must use the define() function, and all you have to do is specify its name to get its value.

Once a constant has been defined, it cannot be changed or undefined. It's pointless to use a $ as a constant. A valid constant's name must start with a letter or an underscore.

5. What do the terms "final class" and "final method" mean?

A method declaration using the final keyword indicates that subclasses will not be able to override the method. A class that has been declared final cannot be subclassed. This is particularly useful for creating immutable classes like the String class. Only classes and methods can be declared final; properties cannot be declared final.

6. In PHP, how do you compare objects?

We use the operator '==' to see if two objects are instanced from the same class and have the same properties and values. To see if two objects are related to the same instance of the same class, we can use the identity operator '==='.

7. What is the relationship between PHP and HTML?

PHP scripts can generate HTML and transmit data between the two. Because PHP is a server-side language and HTML is a client-side language, PHP runs on the server and returns strings, arrays, and objects, which we then utilize to display the values in HTML.

Also Read: Career As A PHP Programmer

8. What is the relationship between PHP and Javascript?

They can't interact directly since PHP is a server-side language and Javascript is a client-side language. We can interchange variables, though, because PHP can generate Javascript code that the browser executes, and specific variables can be provided back to PHP via the URL.

9. What is the difference between a function Object() { [native code] } and a destructor in PHP?

When a PHP class object is created or destroyed, special type functions named function Object() { [native code] } and destructor are automatically called. The function Object() { [native code] } is the more helpful of the two since it allows you to pass arguments along with a new object when creating it, which can then be used to set up variables on the object.

10. What are the functions include() and require()?

Include() is a PHP function that inserts data from one PHP file into another PHP file. If an error occurs, the include() function issues a warning but does not stop the script from running.

The Require() function can also be used to transfer data from one PHP file to another. If there are any errors, they require() method issues a warning and a fatal error, terminating the script's execution.

11. What's the difference between require() and require once(), exactly?

Unlike require(), which includes and evaluates a single file, once() only does so if the file has never been included before. When the called file needs to be included numerous times, the require once() statement can be used to include it. So, required once() is the way to go if you wish to include a file containing a lot of functions.

12. Is it possible to provide a PHP script with an endless execution time?

To avoid the PHP error maximum execution time exceeded, use the set time limit(0) directive at the start of a script to set the execution time to infinite. This can be set in the php.ini configuration file as well.

13. What is the primary distinction between ASP.NET and PHP?

ASP.NET is a programming framework, whereas PHP is a programming language. C#, as well as other languages like J#, may be used in ASP.NET websites. PHP is interpreted, whereas ASP.NET is compiled. PHP is platform-independent and commonly operates on Linux servers, whereas ASP.NET is optimized for Windows PCs.

14. What are the advantages and disadvantages of using sessions and cookies in PHP?

A session is a server-stored global variable. A unique id is assigned to each session and is used to retrieve saved values. When opposed to cookies, sessions can store a lot of data. When the browser is closed, the session values are automatically removed.

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• What is the difference between overloading and overriding in PHP?

Overloading is the process of creating functions with similar signatures but differing parameters. Overriding is only relevant to derived classes when the parent class defines a method that the derived class wants to override. Only the magic method __call can be used to overload methods in PHP.