PHP full notes for class-12

Server-side scripting using PHP

  A scripting language is a kind of web-based programming language for solving web-related problems. Examples of server-side scripting languages are PHP, python, ruby, etc.

                        Server-side scripting is a method of designing websites. They are generally used to create dynamics websites. They are generally used to create dynamics web pages. This means that the page displayed to the user doesn’t exist as a document in a server in its own right and is only brought to the existence in response to the user's request. Therefore, server-side scripting is a block of program code that executes on a web server computer.

Following are the reasons we use PHP for server-side scripting:

· It is embedded in Html.

·  It is used to manage dynamic contents, databases, session tracking, etc.

·  It is integrated with no. of popular databases including MySQL, Oralee, etc.

Introduction to PHP

PHP originally stood for personal web pages but now it is understood as PHP Hypertext pre-processor where any person request for any PHP page in the address bar of the browser that request is first sent to the server interprets PHP file and return back response in the form of HTML. That’s why it is called a hypertext pre-processor.

Features of PHP

Following are the features of PHP:

·    The syntax of PHP is similar to C. So, it is easy to learn and use.

·    PHP runs efficiently on the server-side

·   PHP is the free software under the PHP license. So, it can be easily downloaded from the official PHP website.

·     PHP runs on various platforms like Windows, Linux, UNIX, Mac OS, etc.

·    It is compatible with all servers used today like Apache, IIS, etc.

·    PHP supports a wide range of databases.

The common use of PHP

Following are the common use of PHP:

·  · We can open, create, read, write and close files.

·   · We can add, delete and modify elements within our database in our database.

·  · It can encrypt data.

PHP file

PHP file contains text, html, CSS, JavaScript and PHP code. PHP file has extension .PHP.

 

Hardware requirements:

Following are the hardware requirements:

· 1GHZ CPU processor

· 2 GB ram

 · 1 GB hard disk

Software requirements:

You need to be running PHP 5.4+ on the webserver. The software has been deployed successfully on both Apache and IIS web servers and tested with MYSQL, Maria DV, and MS-SQL server's database at the back end.

Data types of PHP

PHP data types are used to hold different types of data or values. PHP support 8 primitives data types that can be categorized further into 3 types.

·        Scalar type

·        Compound type

·        Special type

 

1.     Scalar type

It holds only single values. Its types are:

·        Boolean

·        Integer

·        Float

·        String

 

2.     Compound type

It can hold multiple values. Its types are:

·        Array

·        Object

 

3.     Special type

Its types are:

·        Resource

·        Null

WAP to reverse a number using PHP:

Connecting server-side scripting to database:

Create a MySQL database using MySQLi:

Create a MySQL table using MySQLi: