An applicant answers the top PHP questions from an interviewer beside her.

Top PHP Interview Questions to Test A Developer’s Skills

If you have an upcoming PHP interview, then it is important to prepare. The best way to do this is by asking them questions that will show the depth of their knowledge. These are some of the top interview questions and answers for testing PHP skills.

What is PHP? If you’re looking for a new language to learn and would like an easy-to-digest introduction, then this post might be just what the doctor ordered. It covers some of the basics about how it works as well as its suitability in different contexts; also included are answers from our experts on interview questions which we hope will help guide your future career path with PHP!

The acronym that stands for “PHP Hypertext Preprocessor” has become hugely popular since 1995 when Rasmus Lerdorf first developed it. This open-source programming language can create dynamic websites or mobile APIs.


What is Pear in PHP


The PEAR framework is a repository for all types of PHP code snippets and libraries. With the use of its command-line interface, you can quickly install packages with ease.


What’s the difference between the include() and require() functions?


The difference between the require and include statement may be confusing for some programmers. They do not both produce a fatal error if there is an issue with including that specific file, so it can be hard to tell which one will work best in certain situations. Require may still pass while Include jumps to the next step in execution without any problems at all!


What’s the difference between static and dynamic websites?


Static websites are made of static content. Dynamic web pages, on the other hand, can change depending on how a visitor interacts with them. For example, Google is full of fresh information that changes every time you visit and Yahoo! always has something new to offer when browsing their news section.


What’s the difference between unset() and unlink()


The unset() function deletes a variable’s contents while the unlink() file deletion utility removes any link between your computer and it.


Is PHP case sensitive?


PHP is partly case sensitive, but function names are not. If you define the function name in lowercase and call them in uppercase, it will still work because PHP does not distinguish between upper- and lower-case letters when looking up functions. User-defined functions are also exempt from being affected by this rule; they can be written with mixed casing without any issue at all!


What are the main error types in PHP?


In PHP there are three main types of errors: Notices – simple, non-critical errors that occur while the script is running. An example would be accessing a variable that has not been defined yet. Warnings – these are more important than notices but scripts continue operating normally after they have occurred. Examples include including an undefined file in your code or invoking a function without specifying its parameters first Fatal Errors will terminate execution when they happen and examples might include trying to access property on an object for which you do not have permission or requiring files that don’t exist.

Making sure to understand the error types is important, as developers can use them to figure out what’s going on during development and where there might be errors in their code.


What are the traits of PHP variables?


Variable assignment in PHP always starts on the left-hand side of an expression with a leading dollar sign ($). A variable can be assigned using any valid value. Once it is given this type of input, that’s what it will remain for as long as you need to use and store data within its boundaries. It doesn’t know up front whether or not there are numbers, letters, symbols, etc., so if your code needs these different options then they should all be properly introduced before assigning variables their values (intrinsic types).


What are the most known Content Management Systems (CMS) in PHP?


WordPress is a type of content management system (CMS) that allows users to create, edit and publish their online posts. WordPress includes the ability for different types of media displays such as blogging news entries or traditional websites with mailing lists and forums. Alongside this, it also supports ecommerce stores in addition to other web-based forms like comments on articles or videos from YouTube/Vimeo along with uploading pictures onto Instagram feeds too!

Joomla is open-source software that provides user’s tools to distribute any kind of web content ranging from blog article updates all the way up through complex models containing features such as discussion boards and storefronts alike – truly providing everything you need for your site’s needs.

Magento is an open-source web development platform that can be used to develop online stores. It offers a flexible layout and many control alternatives for business owners, which are useful in the day-to-day running of their companies. Magento also utilizes Ecommerce software which gives organizations extreme eCommerce setup options with comprehensive support networks available at hand if needed.

Drupal is one such CMS (Content Management System) developed by PHP programmers who offer it under the GNU General Public License – meaning anyone can use it as long as they adhere to certain conditions applied by law on any changes made or code-shared now or later down the line.


What are the top frameworks in PHP?


CakePHP, CodeIgniter, Yii 2, Symfony, and Zend Framework are all-powerful PHP frameworks that can be used to create the websites you need.


What are the PHP variables?


Integers − are whole numbers, without a decimal point. Integers can have any value between -2147483648 and 2147483647. Doubles − are floating-point numbers that require up to 16 digits for the fractional part of the result with an optional +/- sign in front. Booleans values either true or false which represent two possible logical states representing opposite truth conditions NULL is used when no other data type is appropriate like when you want nothing inside of it Strings − sequences made up of characters such as ‘PHP supports string operations’ Arrays− collections containing multiple elements where each element within the collection has its own index Objects ­­instances created by programmers using classes Resources – variables holding references to outside resources


What is the difference between GET and POST?


GET displays the submitted data as part of the URL, during POST this information is not shown as it’s encoded in the request.

GET can handle a maximum of 2048 characters and does not allow binary data while POST has no restrictions on size or type. GET allows only ASCII symbols when encoding submissions which makes them easier to index for search engines where post accepts any kind of character set making better-suited for complex forms with multiple fields that need to be searched/filtered by users inputting different types (think login form).


What do you mean by “echo” and “print” in PHP?


Echo is more efficient than print because it instantaneously prints one or many strings. Print, however, only outputs a single string and always returns 1.


What is NULL?


NULL is a special data type that can have only one value. A variable of NULL, as it has no assigned values. One way to assign the null value would be:

1   $var=null; This assigns an empty space in memory where we may store our information and use it throughout the program at will (similarly to how any other regular variable stores what you give it). You should also know that capitalizing by convention but actually case insensitive means that writing $var = Null; or $variable = NUlL are both acceptab
le ways for assigning this non-value! The following properties exist when using these variables, they evaluate false in boolean contexts and return FALSE when tested with IsSET() function


What is a constant in PHP?


What are constants and how do they differ from variables?

A constant is a special type of variable that has an unchangeable value. Unlike the normal use for variables, which can be changed to represent different values at any time. Constants always have one specific purpose or content in their definition. This means you never need to worry about something being used as both a number and text without your knowledge when using constants!

Constants cannot change once defined because it would break many rules set by computer programming languages such as PHP; however, there may be some exceptions like defining hex color codes with # before them rather than specifying RGB numbers (#0E08).

Leave a Comment

Your email address will not be published.



Job Category

Job Category

Job Type

Job Type

Job Level

Job Level


Send this to a friend