PHP is an open source scripting language used to build server-side web applications. PHP code is embedded within HTML files and executed on the server to generate dynamic web page content. PHP can connect to databases, collect form data, and perform many other common web development tasks. It is a free and popular language due to its flexibility, power, and ease of use.

1. PHP

2. What is PHP
 What is PHP?
 PHP is an acronym for "PHP Hypertext Preprocessor"
 PHP is a widely-used, open source scripting language
 PHP scripts are executed on the server
 PHP costs nothing, it is free to download and use
 Note PHP is an amazing and popular language!
 It is powerful enough to be at the core of the biggest blogging system on the web (WordPress)!
 It is deep enough to run the largest social network (Facebook)!
 It is also easy enough to be a beginner's first server side language!
 text, such as XHTML and XML.

3. What is a PHP File?
 PHP files can contain text, HTML, CSS, JavaScript, and PHP code
 PHP code are executed on the server, and the result is returned to the browser as plain HTML
 PHP files have extension ".php"
 What Can PHP Do?
 PHP can generate dynamic page content
 PHP can create, open, read, write, delete, and close files on the server
 PHP can collect form data
 PHP can send and receive cookies
 PHP can add, delete, modify data in your database
 PHP can restrict users to access some pages on your website
 PHP can encrypt data
 With PHP you are not limited to output HTML. You can output images, PDF files, and even Flash movies. You can also output any

4. Why PHP?
 PHP runs on various platforms (Windows, Linux, Unix,
Mac OS X, etc.)
 PHP is compatible with almost all servers used today
(Apache, IIS, etc.)
 PHP supports a wide range of databases
 PHP is free. Download it from the official PHP resource:
www.php.net
 PHP is easy to learn and runs efficiently on the server
side

5. Connecting to Database
 Database Driver
 PDO (PHP Data Objects) is a database driver the will work on 12 different database systems. It comes
pre-installed with php5
<?php
$servername = "localhost";
$username = "username";
$password = "password";
try {
$conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
echo "Connected successfully";
}
catch(PDOException $e)
{
echo $e->getMessage();
}
?>

6. Creating a Database
<?php
$servername = "localhost";
$username = "root";
$password = "root”;
try {
$conn = new PDO("mysql:host=$servername;dbname=COSC531", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "CREATE DATABASE myDBPDO";
// use exec() because no results are returned
$conn->exec($sql);
echo "Database created successfully";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();

7. Creating a Table
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=myDBPDO", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// sql to create table
$sql = "CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,

8. Inserting into a Table
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
// use exec() because no results are returned
$conn->exec($sql);
echo "New record created successfully";
}

9. Last Id inserted
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
// use exec() because no results are returned
$conn->exec($sql);
$last_id = $conn->lastInsertId();
echo "New record created successfully. Last inserted ID is: " . $last_id;

10. Inserting Multiple Records
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// begin the transaction
$conn->beginTransaction();
// our SQL statememtns
$conn->exec("INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')");

11. Select
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

12. Delete from Table
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// sql to delete a record
$sql = "DELETE FROM MyGuests WHERE id=3";
// use exec() because no results are returned
$conn->exec($sql);

13. Delete from Table
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "UPDATE MyGuests SET lastname='Doey' WHERE id=2";
// Prepare statement
$stmt = $conn->prepare($sql);

14. Do I actually use this?
 NO!
 I use framworks that encapsilate the DB operation
 Drupal uses operations on nodes and entity to develop
queries in the background
 Symphony/Laravel user ORM(object relational
mapping) to develop queries in the backgroud

15. If the framework does the work,
Why do I need to know this
 Without an understanding of the underlying architecture
and techniques to manipulate that architechture