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')");
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
