What is PHP?

PHP is a server side scripting language. that is used to develop Static websites or Dynamic websites or Web applications. PHP stands for Hypertext Pre-processor, that earlier stood for Personal Home Pages.

PHP scripts can only be interpreted on a server that has PHP installed.

The client computers accessing the PHP scripts require a web browser only.

A PHP file contains PHP tags and ends with the extension “.php”.

What is a Scripting Language?

A script is a set of programming instructions that is interpreted at runtime.

A scripting language is a language that interprets scripts at runtime. Scripts are usually embedded into other software environments.

The purpose of the scripts is usually to enhance the performance or perform routine tasks for an application.

Server side scripts are interpreted on the server while client side scripts are interpreted by the client application.

PHP is a server side script that is interpreted on the server while JavaScript is an example of a client side script that is interpreted by the client browser. Both PHP and JavaScript can be embedded into HTML pages.

Programming Language Vs Scripting Language

Programming languageScripting language
Has all the features needed to develop complete applications.Mostly used for routine tasks
The code has to be compiled before it can be executedThe code is usually executed without compiling
Does not need to be embedded into other languagesIs usually embedded into other software environments.

What does PHP stand for?

PHP means – Personal Home Page, but it now stands for the recursive backronym PHP: Hypertext Preprocessor.

PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management system and web frameworks.

Php Syntax

What is PHP? Write your first PHP Program

A PHP file can also contain tags such as HTML and client side scripts such as JavaScript.

  • HTML is an added advantage when learning PHP Language. You can even learn PHP without knowing HTML but it’s recommended you at least know the basics of HTML.
  • Database management systems DBMS for database powered applications.
  • For more advanced topics such as interactive applications and web services, you will need JavaScript and XML.

The flowchart diagram shown below illustrates the basic architecture of a PHP web application and how the server handles the requests.

What is PHP? Write your first PHP Program

Why use PHP?

You have obviously head of a number of programming languages out there; you may be wondering why we would want to use PHP as our poison for the web programming. Below are some of the compelling reasons.

  • PHP is open source and free.
  • Short learning curve compared to other languages such as JSP, ASP etc.
  • Large community document
  • Most web hosting servers support PHP by default unlike other languages such as ASP that need IIS. This makes PHP a cost effective choice.
  • PHP is regular updated to keep abreast with the latest technology trends.
  • Other benefit that you get with PHP is that it’s a server side scripting language; this means you only need to install it on the server and client computers requesting for resources from the server do not need to have PHP installed; only a web browser would be enough.
  • PHP has in built support for working hand in hand with MySQL; this doesn’t mean you can’t use PHP with other database management systems. You can still use PHP with
    • Postgres
    • Oracle
    • MS SQL Server
    • ODBC etc.
  • PHP is cross platform; this means you can deploy your application on a number of different operating systems such as windows, Linux, Mac OS etc.

What is PHP used for & Market share

In terms of market share, there are over 20 million websites and application on the internet developed using PHP scripting language.

This may be attributed to the points raised above;

The diagram below shows some of the popular sites that use PHP

What is PHP? Write your first PHP Program

PHP vs Asp.Net VS JSP VS CFML

ASP – Active Server Pages, JSP – Java Server Pages, CFML – Cold Fusion Markup language The table below compares the various server side scripting languages with PHP

FEATUREPHPASPJSPCFML
Learning curveshortLonger than PHPLonger than PHPLonger than PHP
Web hostingSupported by almost all hosting serversNeeds dedicated serverFairly supportedNeeds dedicated server
Open sourceYesNoYesBoth commercial and open source
Web services supportBuilt inUses the .NET frameworkUses add on librariesBuilt in
Integration with HTMLEasyFairly complexFairly complexEasy
MySQL supportNativeNeeds third party driversNeeds third party driversCurrent version has native support. Older versions use ODBC
Easily extended by other languagesYesNoExtended using Java classes and libraries.Yes

PHP File Extensions

File extension and Tags In order for the server to identify our PHP files and scripts, we must save the file with the “.php” extension. Older PHP file extensions include

  • .phtml
  • .php3
  • .php4
  • .php5
  • .phps

PHP was designed to work with HTML, and as such, it can be embedded into the HTML code.

What is PHP? Write your first PHP Program

You can create PHP files without any html tags and that is called Pure PHP file .

The server interprets the PHP code and outputs the results as HTML code to the web browsers.

In order for the server to identify the PHP code from the HTML code, we must always enclose the PHP code in PHP tags.

A PHP tag starts with the less than symbol followed by the question mark and then the words “php”.

PHP is a case sensitive language, “VAR” is not the same as “var”.

The PHP tags themselves are not case-sensitive, but it is strongly recommended that we use lower case letter. The code below   illustrates the above point.

<?php … ?>

We will be referring to the PHP lines of code as statements. PHP statements end with a semi colon (;). If you only have one statement, you can omit the semi colon. If you have more than one statement, then you must end each line with a semi colon. For the sake of consistency, it is recommended that you always end your statement(s) with a semi colon.  PHP scripts are executed on the server. The output is returned in form of HTML.

PHP Hello world

The program shown below is a basic PHP application that outputs the words “Hello World!” When viewed in a web browser.

<?php
echo "Hello world";
?>

Output:

Hello world

Summary

  • PHP stands for Hypertext pre-processor
  • PHP is a server side scripting language. This means that it is executed on the server. The client applications do not need to have PHP installed.
  • PHP files are saved with the “.php” file extension, and the PHP development code is enclosed in tags.
  • PHP is open source and cross platform

Source: Guru99

You might want to read

share this post

Share on facebook
Facebook
Share on google
Google+
Share on twitter
Twitter
Share on linkedin
LinkedIn
Please feel free to fill in your details below and we’ll try to reach you as soon as we can so we can talk about this project of yours.

Please elaborate this project and upload some supporting documents here so we can understand this project better and give you some consultation:

Your Personally Identified Information (PII) is secure with us and will not be shared with any third party and will not be included in any type of database. By submiting this form you agree for us to call you at any time or send you emails specific to our niche. We suggest that you read our privacy policy here.

stay informed!

Subscribe to receive exclusive content and notifications