PHP & MySql - Interview Questions & Answers for Freshers.

Top Interview Questions and Answers you need to know as a Freshers

If you are preparing for a PHP & MySql interview, then you have reached the right place.

Computer Science Engineering is a broad field of study that deals with the PHP & MySql.

It is a fast-growing field that has many opportunities for career growth. A PHP & MySql interview is a type of interview that is designed to assess a candidate's knowledge of Computer Science Engineering . The purpose of the interview is to evaluate the candidate's knowledge and deep understanding of subject.

The interview may also assess the candidate's communication skills, such as the ability to present complex information in a clear and concise manner.

The Interview is typically conducted by a hiring manager or recruiter who has experience in the field. The interviewer will typically ask a series of questions about the candidate's background and experience. The interviewer will also ask about the candidate's strengths and weaknesses.

This list of interview questions in PHP & MySql includes basic-level, advanced-level, and program-based interview questions.

Here are the commonly asked question list of PHP & MySql (Computer Science Engineering) interview questions and answers that you must prepare for fresher as well as experienced candidates to get your dream job.

1 What is PHP?

PHP stands for Hypertext Preprocessor. It is an open source server-side scripting language which is widely used for web development. It supports many databases like MySQL, Oracle, Sybase, Solid, PostgreSQL, generic ODBC etc.

PHP involves control statements, functions, array, string, file handling, form handling, regular expression, date and time, object-oriented programming in PHP, math, PHP MySQL, PHP with Ajax, PHP with jQuery and PHP with XML.

HP is an open-source, interpreted, and object-oriented scripting language that can be executed at the server-side. PHP is well suited for web development. Therefore, it is used to develop web applications (an application that executes on the server and generates the dynamic page.).

  • PHP stands for Hypertext Preprocessor.
  • PHP is an interpreted language, i.e., there is no need for compilation.
  • PHP is faster than other scripting languages, for example, ASP and JSP.
  • PHP is a server-side scripting language, which is used to manage the dynamic content of the website.
  • PHP can be embedded into HTML.
  • PHP is an object-oriented language.
  • PHP is an open-source scripting language.
  • PHP is simple and easy to learn language.

2 Why use PHP?

PHP is a server-side scripting language, which is used to design the dynamic web applications with MySQL database.

  • It handles dynamic content, database as well as session tracking for the website.
  • You can create sessions in PHP.
  • It can access cookies variable and also set cookies.
  • It helps to encrypt the data and apply validation.
  • PHP supports several protocols such as HTTP, POP3, SNMP, LDAP, IMAP, and many more.
  • Using PHP language, you can control the user to access some pages of your website.
  • As PHP is easy to install and set up, this is the main reason why PHP is the best language to learn.
  • PHP can handle the forms, such as - collect the data from users using forms, save it into the database, and return useful information to the user. 

For example - Feedback form. login, Registration form.

PHP Features are 

Performance : PHP script is executed much faster than those scripts which are written in other languages such as JSP and ASP. PHP uses its own memory, so the server workload and loading time is automatically reduced, which results in faster processing speed and better performance.

Open Source : PHP source code and software are freely available on the web. You can develop all the versions of PHP according to your requirement without paying any cost. All its components are free to download and use. 

Familiarity with syntax : PHP has easily understandable syntax. Programmers are comfortable coding with it.

Embedded : PHP code can be easily embedded within HTML tags and script. 

Platform Independent : PHP is available for WINDOWS, MAC, LINUX & UNIX operating system. A PHP application developed in one OS can be easily executed in other OS also.

Database Support : PHP supports all the leading databases such as MySQL, SQLite, ODBC, etc.

Error Reporting : PHP has predefined error reporting constants to generate an error notice or warning at runtime. E.g., E_ERROR, E_WARNING, E_STRICT, E_PARSE.

Loosely Typed Language : PHP allows us to use a variable without declaring its datatype. It will be taken automatically at the time of execution based on the type of data it contains on its value.

Web servers Support : PHP is compatible with almost all local servers used today like Apache, Netscape, Microsoft IIS, etc.

Security : PHP is a secure language to develop the website. It consists of multiple layers of security to prevent threads and malicious attacks.

Control : Different programming languages require long script or code, whereas PHP can do the same work in a few lines of code. It has maximum control over the websites like you can make changes easily whenever you want.

3 Explain the difference b/w static and dynamic websites?

In static websitescontent can't be changed after running the script. You can't change anything on the site. It is predefined.

In dynamic websitescontent of script can be changed at the run time. Its content is regenerated every time a user visit or reload. Google, yahoo and every search engine is the example of dynamic website.

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

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  • 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).
  • Some others are also used CakePHP, CodeIgniter, Yii 2, Symfony, Zend Framework etc.