This document discusses PHP, which stands for Hypertext Preprocessor. PHP is an open-source server-side scripting language used to create dynamic web pages. PHP code is embedded within HTML and executed on the server-side, so the source code is not visible to clients. PHP can interact with databases like MySQL to retrieve and manipulate data for web pages. The document also provides examples of using PHP with MySQL to create a database.

1. BY
M.LAVANYA,M.SC(CS)
NADAR SARASWATHI COLLEGE
OF ARTS AND SCIENCE ,THENI.

2.  PHP == ‘HYPERTEXT PREPROCESSOR’
 open-source, server-side scripting language
 Used to generate dynamic web-pages
 PHP scripts reside between reserved PHP tags
• This allows the programmer to embed PHP scripts within HTML
pages

3.  Interpreted language, scripts are parsed at run-time
rather than compiled beforehand
 Executed on the server-side
 Source-code not visible by client
• ‘view source’ in browsers does not display the PHP code
 Various built-in functions allow for fast development
 Compatible with many popular databases

4.  PHP is a general-purpose server-side scripting language
originally designed for web development to produce
dynamic web pages .
 PHP can interact with My SQL databases.

5.  Structurally similar to C/C++
 Support procedural and object-oriented paradigm (to
some degree)
 All PHP statements end with a semi-colon
 Each PHP script must be enclosed in the reserved PHP
tag
<?php
……
?>

6.  Standard C, C++, and shell comment symbols.
//C++ and java-style comment
# shell-style comments
/* C-style comments
These can span multiple lines*/

7.  PHP variables must begin with a “$” sign.
 Case-sensitive
 Global and locally-scoped variables.
• global variables can be used anywhere
• local variables restricted to a function or class
 Certain variable names reserved by PHP
• form variables ($_POST, $_GET)
• server variables($_ SERVER)
 Etc.

8. • MySQL is a database system used on the web
• MySQL is a database system that runs on a server
• MySQL is ideal for both small and large applications
• MySQL is very fast, reliable, and easy to use
• MySQL uses standard SQL
• MySQL compiles on a number of platforms
• MySQL is free to download and use
• MySQL is developed, distributed, and supported by
Oracle Corporation
• MySQL is named after co-founder Monty Widenius's
daughter: My

9. • The data in a MySQL database are stored in tables. A
table is a collection of related data, and it consists of
columns and rows.
• Databases are useful for storing information categorically.
A company may have a database with the following
tables:
• Employees
• Products
• Customers
• Orders

10. • PHP combined with MySQL are cross-platform (you can
develop in Windows and serve on a Unix platform)

11. • A query is a question or a request.
• We can query a database for specific information and
have a record set returned.
• Look at the following query (using standard SQL):
SELECT LastName FROM Employees
• The query above selects all the data in the "LastName"
column from the "Employees" table.

12.  PHP 5 and later can work with a MySQL database using:
• MySQLi extension (the "i" stands for improved)
• PDO (PHP Data Objects)
 Earlier versions of PHP used the MySQL extension.
However, this extension was deprecated in 2012.

13. • The CREATE DATABASE statement is used to create a
database in MySQL.
• The following examples create a database named
"myDB":

14. Example (MySQLi Object-oriented)
<?php
$servername = "localhost";
$username = "username";
$password = "password";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
// Create database
$sql = "CREATE DATABASE myDB";
if ($conn->query($sql) === TRUE) {
echo "Database created successfully";
} else {
echo "Error creating database: " . $conn->error;
}
$conn->close();
?>