PHP is a server-side scripting language that allows embedding programs into HTML pages. PHP scripts are made up of statements terminated with semicolons that are interpreted by the server before sending the page to the browser. Variables and control structures like loops and conditionals can be used. PHP allows pages to serve multiple purposes like displaying information and tracking site metrics. To connect to a database, a server, username, password, and database name are required. Queries can then retrieve and manipulate data which is returned as an object. Data needs formatting before editing like updating or deleting displayed records.

1. Web and Database
Integration

2. Server Side Scripting Requirements
 PHP is a server-side scripting language which is similar to JavaScript as it
allows you to embed little programs (scripts) into the HTML of web page.
 The difference between PHP and JavaScript is that when the web browser
interprets JavaScript the scripts are downloaded whereas a web page
containing PHP will be interpreted before the page is sent to the browser.
 PHP Scripts consists of statements, each of which is an instruction the web
server must follow before moving onto the next one.
 Each PHP statement is terminated by a semicolon.

3. PHP Syntax, Variables, Requirements, Control
Structures and Multi-Purpose Pages
 PHP Scripts consists of statements, each of which is an instruction the web
server must follow before moving onto the next one.
 Each PHP statement is terminated by a semicolon.
 Variables in PHP are the same as other programming languages – same types
of variables, standard arithmetic operations and use of arrays.
 Statements in PHP are called control structures.
 Loops -IF/ELSE, FOR and WHILE are used in PHP statements as control
structures.
 PHP allows one pages to serve more than one purpose, for example, a web
page that displays information and contains a site counter.

4. Connecting to Database
 To connect to a database server, the following is required:
 Server, IP address or name of the server on which the database server software is
running.
 Username and password, required to connect to the database server.
 Name of the database stored on the database server that you want to connect to.
 Queries can then be executed on the connected database to retrieve
information.
 The result set from the query is provided as an object.

5. Editing and Amending Data
 Data needs to be displayed in a suitable format before it can be edited:
 Amending details – Updates the displayed information
 Deleting – Displayed information can be deleted when no longer required.

6. What you need to know…
 Connect to a database to process data.
 Read and write data, to and from a database.
 Be able to insert, amend and deletion queries.
 Process a form using server-side scripting.