Most Asked PHP Interview Questions You Should Definitely know

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PHP is one of the most preferred languages for well-known content management systems like WordPress, Magento, Joomla etc. For small start-ups to large enterprises, companies still hire PHP developers as actively as they used to do before.

One of the more popular scripting language, first found in 1995, PHP has had a fair share of fame all these years. It has several uses and performs countless functions. If you feel that the essence of PHP has settled down over the years since the advent of newer languages, think again.

When you take into account the contemporary market of software development, PHP is the leader in server-side programming language.

Let’s back the argument with some statistics. A latest suvey reveals that PHP is used by 79.8% of the websites for server-side programming. This shows just how popular PHP is among web developers and entrepreneurs.

PHP Hypertext Pre-processor or PHP, is highly compatible with HTML and comes in handy when developing a single page. Websites like Wikipedia, Facebook, etc have harnessed the power of PHP.

Not only that, PHP is one of the most preferred languages for well-known content management systems like WordPress, Magento, Joomla etc. For small start-ups to large enterprises, companies still hire PHP developers as actively as they used to do before.

Here are 10 of the most asked PHP interview questions you must know as a PHP developer.

What are the common uses of PHP?


Some of the most common uses of PHP include:

  • With PHP, you can perform system functions pertaining to files on a system where it can create, open, read, write, and close them entirely.
  • The language is capable enough to handle forms, i.e. gather data from files, save data to a file, through email you can send data, return data to the user.
  • One can easily add, delete, and modify elements within the database using PHP. You can also access cookies variables and set cookies.
  • PHP allows developers to restrict users from accessing some pages of your website and also encrypt the data.


What are the main error types in PHP and how do they differ?


When we talk about errors, there are threee main types of errors found in PHP:

Warnings:- These are a relatively important errors that needs attention. They are not just notices. However, the scripts continue the execution, they do not stop. As an example, you can take include() a file that does not exist.

Notices:- These are simple, non-critical errors which can take place during the script execution. One example of a Notice can be accessing an undefined variable.

Fatal:- A fatal error is a rather serious error that causes a termination of the script execution when it occurs. One example of Fatal error would be accessing a property of a non-existent object or require() a non-existent file.


What do you understand when we state PHP as whitespace insensitive?


In general terms, we state that whitespace is the stuff you type that is typically invisible on the screen. This includes spaces, tabs, and carriage returns or end-of-line characters etc, In terms of PHP, whitespace insensitive means that it entirely does not matter how many whitespace characters you have got in a row. A single whitespace character is the same as many such characters.

Provide in brief a few charactericstics of PHP variables?


Almost all of the variables in PHP are denoted with a leading dollar sign ($).

The value of a PHP variable is the core value of its most recent assignment.

Variables can be declared before an assignment, but in most cases it is not needed.

The PHP variables do not have intrinsic types. A variable will never know in advance whether or not it will be used to store a number or a string of characters.

The variables in PHP are assigned with the = operator. Where the variable is on the left-hand side and the expression to be evaluated stays on the right.

Variables executed before they are assigned have default values.

Most of the PHP variables are Perl-like.

Conclusion


PHP as a programming language has a long-standing feature. With the increasing demand for website development, the demand to hire PHP developers never satiates. There will always be a demand for skilled, well-versed PHP developers as long as there is a demand for building websites.