PHP info

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