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PHP Interview Questions and Answers

  • What is PHP?
    PHP - it is a general purpose programming language used to develop a website or web application. It is a server-side scripting language embedded in HTML for developing static website, dynamic website, or web applications. It was created by Rasmus Lerdorf in 1994.
  • What is PHP full form?
    PHP - is an acronym for Hypertext Preprocessor and was previously abbreviated as Personal Home Page.
  • What was the old PHP name?
    The old PHP name was Personal Home.
  • What are the uses of PHP?
    • It is a server-side scripting language used to develop dynamic websites or web applications.
    • It is receives data from forms to create dynamic page content.
    • It can work with databases, sessions, send and receive cookies, send emails, etc.
    • It can be used to add, delete, change the content in the database.
    • It can be used to set the restriction of user access to the web page.
  • What is a pear in PHP?
    PEAR - it is a framework and distribution system for reusable PHP components. It stands for PHP Extension and Application Repository. It contains PHP snippets and a library to root the code. It provides a command line interface for installing packages.
  • What is the difference between static and dynamic sites?
    • Static website:web pages are returned from the server, which are pre-built source code files created using simple languages, such as HTML, CSS or JavaScript. Static websites do not have server-side content processing.
    • Dynamic website:web pages are returned from a server that is processed at runtime, which means they are not pre-built web pages, but are created at runtime according to user requirements using server-side scripting languages ​​such as PHP, Node.js. , ASP.NET, and more is supported by the server.
  • What’s the right way and the two most common ways to start and end a block of PHP code?
    PHP code always starts with
  • How to execute a PHP script from the command line?
    Use the following steps to run a PHP program with command line:
    • Open a terminal or command prompt window.
    • Go to the specified folder or directory where the PHP files are present.
    • Then we can run the PHP code, using the command php file_name.php
    • Start the server to check the php code using the command php -S localhost: port -t your_folder /
  • How to display text using PHP script?
    There are two methods echoand print to display text.
  • Is PHP case sensitive?
    No, PHP is partially case sensitive. This means that variable names are case sensitive,and function names are case insensitive,i.e. user-defined functions are not case sensitive.
  • What is the main difference between PHP 4 and PHP 5?
    PHP 5 contains many additional OOP features (Object Oriented Programming).
  • What are the rules for naming PHP variables?
    Variables in the program are used to store some values ​​or data that can later be used in the program. PHP has its own way of declaring and storing variables. Variable characteristics are listed below:
    • A variable declared in PHP must begin with a dollar sign ($) followed by the variable name.
    • The variable name contains alphanumeric characters and underscores ( i.e. ’ az ’, ’ AZ ’, ’ 0-9 ’ and ’ _ ’) in their name.
    • Variable names must start with a letter or underscore, not a number.
    • PHP is a loosely typed language and we do not need to declare the data types of variables, rather PHP accepts this automatically when it parses the values.
    • PHP variables are case sensitive, i.e. $sum and $SUM are handled differently.
  • How do you define a constant in PHP?
    The define() function is used to create and get the value of a constant. PHP Constant - it is an identifier whose value cannot be changed over time (for example, the domain name of a website, for example, www.engineerforengineer.org). Once you define a constant, it can never be changed or undefined. The $symbol is not used with a constant.
  • What are the popular Content Management Systems (CMS) in PHP?
    • WordPress:WordPress - it is a free open source platform (CMS). It is the most widely used CMS in recent times.
    • Joomla:It is a free open source content management system (CMS) for distributing web content. This follows the model-view-controller web application structure that can be used independently.
    • Magento:is an open source and e-commerce platform for developing online businesses.
    • Drupal:is a Content Management System (CMS) platform developed in PHP and released under the GNU General Public License.
  • What is the purpose of breaking and continuing the statement?
    • break:The break statement immediately ends the entire iteration of the loop, and program control resumes with the next statement following loop.
    • continue:The continue statement skips the current iteration and continues the next iteration earlier. Continuation 2 acts as a terminator for case case and skips the current loop iteration.
  • What are the popular frameworks in PHP?
    • Laravel
    • CodeIgniter
    • Symfony
    • CakePHP
    • Yii
    • Zend Framework
    • Phalcon
    • FuelPHP
    • PHPixie
    • Slender
  • How to make single and multiline comments in PHP?
    Comments are used to prevent a statement from being executed. This is ignored by the compiler. There are two types of comments in PHP: single line comments and multiline comments.
    • Single line comments:comments start with a double slash (//).
    • Multi-line comment:comments are enclosed in / * comment section * /
  • What is the use of the PHP count() function?
    The PHP count() function is used to count the number of elements in an array. The function can return 0 for a variable that has been set to an empty array. Also, for a variable that is not set, the function returns 0.
  • What are the types of loops in PHP?
    PHP supports four different types of for loop, which are listed below:
    • for loop
    • while loop
    • action loop
    • foreach loop
  • What is the difference between for and foreach loops in PHP?
    • The for loop is considered open to iterate, while the foreach hides the iteration and is noticeably simplified.
    • The performance of the foreach loop is considered better than the for loop.
    • The foreach loop, although it iterates an array of elements, execution is simplified and completes in less time than a for loop.
    • The foreach loop allocates temporary memory for index iterations, which makes the system as a whole performance overkill in terms of memory allocation.
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