PHP Interview Questions – Set 01

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What is PEAR in PHP?

PEAR is a framework and repository for reusable PHP components. PEAR stands for PHP Extension and Application Repository. It contains all types of PHP code snippets and libraries.

It also provides a command line interface to install “packages” automatically.

How many data types are there in PHP?

PHP data types are used to hold different types of data or values. There are 8 primitive data types which are further categorized in 3 types:

  • Scalar types
  • Compound types
  • Special types

What is “print” in PHP?

PHP print output a string. It is a language construct not a function. So the use of parentheses is not required with the argument list. Unlike echo, it always returns 1.

Syntax:

int print ( string $arg)

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

  • WordPress: WordPress is a free and open-source content management system (CMS) based on PHP & MySQL. It includes a plug-in architecture and template system. It is mostly connected with blogging but supports another kind of web content, containing more traditional mailing lists and forums, media displays, and online stores.
  • Joomla: Joomla is a free and open-source content management system (CMS) for distributing web content, created by Open Source Matters, Inc. It is based on a model-view-controller web application framework that can be used independently of the CMS.
  • Magento: Magento is an open source E-trade programming, made by Varien Inc., which is valuable for online business. It has a flexible measured design and is versatile with many control alternatives that are useful for clients. Magento utilizes E-trade stage which offers organization extreme E-business arrangements and extensive support network.
  • Drupal: Drupal is a CMS platform developed in PHP and distributed under the GNU (General Public License).

How to do single and multi line comment in PHP?

PHP single line comment is made in two ways:

  • Using // (C++ style single line comment)
  • Using # (Unix Shell style single line comment)
    PHP multi-line comment is made by enclosing all lines within.

What is the difference between “echo” and “print” in PHP?

Echo can output one or more string but print can only output one string and always returns 1.

Echo is faster than print because it does not return any value.

Who is known as the father of PHP?

Rasmus Lerdorf

What are the different loops in PHP?

For, while, do-while and for each.

What are the popular frameworks in PHP?

  • CakePHP
  • CodeIgniter
  • Yii 2
  • Symfony
  • Zend Framework etc.

How a variable is declared in PHP?

A PHP variable is the name of the memory location that holds data. It is temporary storage.

Syntax:

$variableName=value;