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PHP on a Fast Track a quick introduction to PHP programming by Jarek Francik last time updated in 2012
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PHP on a Fast Tracka quick introduction to PHP programmingby Jarek Franciklast time updated in 2012
Client & Server
Client Server
Client & Server
Client Server
Client & Server
Client Server
Remote File System
Client & Server
Client Server
REQUEST: GET
RESPONSE: HTML
Remote File System
Client & Server
CLIENT SIDE PROCESSING
Client Server
REQUEST: GET
RESPONSE: HTML
Files served over the network may contain HTML, CSS, JavaScript,Flash and may be pretty much complex!
Remote File System
Client & Server
Client Server
REQUEST: GET
RESPONSE: HTML
Remote File System
Client & Server
Client Server
REQUEST: GET
RESPONSE: HTML
Remote File SystemREQUEST: GETRESPONSE: HTML
Client & Server
Client Server
REQUEST: POST
RESPONSE: HTML
Remote File SystemRESPONSE: HTML
REQUEST: POST
DB
Client & Server
Client Server
REQUEST: POST
RESPONSE: PHP
Remote File SystemREQUEST: POSTRESPONSE: PHP
DB
SERVER SIDE PROCESSING
Great Hiking ShoePerfect Company
Client-Side Processing Server-Side Processing
DB
Client-Side Processing• Executed locally, on client’s
computer• Results visible immediately
• Fast & dynamic• Processing within a single
webpage• Information cannot be shared• No Databases*• Keeping things secret is very
difficult – everything is on the user’s computer* Limited local database functionality is available in HTML5, but without sharing
Server-Side Processing• Executed remotely, on
a web server• Results must be sent over the
network• Network latency• Pages must be re-loaded in
order to view the results*• Information easily shared• Database back-end• Flexible and powerful security
control * AJAX technology allows for remote updates without pages being reloaded but technically it is a combination of server side and client side technologies
PHP
• Scripting language for web development• Created by Rasmus Lerdorf 16 years ago• Currently phasing out• Easy to learn but time-consuming to use
Let’s writea shopping cart application
What do we need?
• Operating System• Web Server• Database• Scripring Language
Windows, Linux, MacOS...Appache, IIS, WEBrick...MySQL, Postgres, SQLite, Oracle...PHP, Perl, Python, Ruby, C#, Java...
DB
What do we need?
• Operating System• Web Server• Database• Scripring Language
Windows, Linux, MacOS...Appache, IIS, WEBrick...MySQL, Postgres, SQLite, Oracle...PHP, Perl, Python, Ruby, C#, Java...
DB
What do we need?
• Operating System• Web Server• Database• Scripring Language
Linux, Windows, MacOS...Appache, IIS, WEBrick...MySQL, Postgres, SQLite, Oracle...PHP, Perl, Python, Ruby, C#, Java...
DB
What do we need?
• Operating System• Web Server• Database• Scripring Language
MacOS, Windows, Linux...Appache, IIS, WEBrick...MySQL, Postgres, SQLite, Oracle...PHP, Perl, Python, Ruby, C#, Java...
DB
What do we need?
• Operating System• Web Server• Database• Scripring Language
X - PlatformAppacheMySQL PHP Perl
DB
What do we need?
• Operating System• Web Server• Database• Scripring Language
XAM P P
DB
XAMPP
http://www.apachefriends.org/en/xampp.html
or google for “xampp”
KU Server
• There is a web server available for you at
http://studentnet.kingston.ac.uk
• Find all details there (or check the end of this presentation)
XAMPP
1. Download and install – it’s easy2. Run XAMPP Control Panel3. Start Apache & MySql4. Run in your browser:
http://localhost5. Click Explore and go
to htdocs to browseyour web files
6. Use MySql Admin tosetup your databasewith mySqlAdmin
phpMyAdmin
phpMyAdmin
phpMyAdmin
phpMyAdmin
phpMyAdmin
phpMyAdmin
Database structure (SQL)USE test; CREATE TABLE goods ( id int(6) unsigned NOT NULL auto_increment, item varchar(100) NOT NULL default '', price decimal(6,2) NOT NULL default '0.00', image varchar(100) NOT NULL default '', PRIMARY KEY (id) );
INSERT INTO goods VALUES (1, 'Soap', '4.99'); INSERT INTO goods VALUES (2, 'Strawberry Jam', '1.99'); INSERT INTO goods VALUES (3, 'Toothpaste', '2.49'); INSERT INTO goods VALUES (4, '8GB Memory Stick', '22.99');
The First PHP File<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <html><head>
<title>Your Cart</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head> <body> <h1>Your Cart</h1> <?php
?></body></html>
cart.php0
The First PHP File<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <html><head>
<title>Your Cart</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head> <body> <h1>Your Cart</h1> <?php echo "Hello, world!"; ?></body></html>
cart.php
Another File: Front Page<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head>
<title>Your Shop</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head><body> <h1>Your Shop</h1> <ul> <li><a href="cart.php?action=add&id=1">Add item #1 to the cart</a></li> <li><a href="cart.php?action=add&id=2">Add item #2 to the cart</a></li> <li><a href="cart.php?action=add&id=3">Add item #3 to the cart</a></li> <li><a href="cart.php?action=add&id=4">Add item #4 to the cart</a></li> </ul> <p><a href="cart.php?action=show">Show your cart</a></p></body></html>
index.php1
What the application should do
• http://localhost/cart.php?action=show• http://localhost/cart.php?action=add&id=2
What the application should do
• http://localhost/cart.php?action=show• http://localhost/cart.php?action=add&id=2
<?php $action = $_GET['action']; $id = $_GET['id']; echo "<p>DEBUG: Action to do is $action, and item id is $id.</p>";?>
cart.php1
Make information persistent
• HTTP as a stateless protocolprotocol with no memory of who you are
• Cookies• Sessions• Session variables
$_SESSION['cart']
Name of the variable
Collection of session variables
Make information persistent<?php session_start(); ?> must appear in the
first line (before DOCTYPE)
cart.php
Make information persistent<?php session_start(); ?>
......
<?php $cart = $_SESSION['cart']; $action = $_GET['action']; $id = $_GET['id'];
echo "<p>DEBUG: Action to do is $action, and item id is $id.</p>"; if ($action == 'add') { $cart = $cart . ",$id"; $_SESSION['cart'] = $cart; } echo "<p>DEBUG: Cart is: $cart</p>";?>
must appear in the first line (before
DOCTYPE)
cart.php2
Display Your Cart<?php $cart = $_SESSION['cart']; $action = $_GET['action']; $id = $_GET['id'];
if ($action == 'add') { $cart = $cart . ",$id"; $_SESSION['cart'] = $cart; } $myitems = explode(',', $cart); // explode using comma as a separator if (count($myitems) <= 1) echo "<p>Your cart is empty.<p>"; else foreach ($myitems as $i) if ($i != '') { echo "<p>Item id: $i</p>"; }?>
cart.php3
Connect to the Database<?php $hostname = 'localhost'; // localhost is the URL of the server $username = 'root'; // the username in this example is root $password = 'elvis'; // put here your MySQL root password // connect to the database server $con = mysql_connect($hostname, $username, $password) or die ('Could not connect: ' . mysql_error()); // display if connection failed mysql_select_db("test", $con); // choose the test database ...
cart.php
Connect to the Database<?php $hostname = 'localhost'; // localhost is the URL of the server $username = 'root'; // the username in this example is root $password = 'elvis'; // put here your MySQL root password // connect to the database server $con = mysql_connect($hostname, $username, $password) or die ('Could not connect: ' . mysql_error()); // display if connection failed mysql_select_db("test", $con); // choose the test database ...
Provide the proper username & password
(the latter maybe ‘’)
cart.php
Display Your Items.... foreach ($myitems as $i) if ($i != '') { $result = mysql_query("SELECT * FROM goods WHERE id = $i"); $row = mysql_fetch_array($result); $item = $row['item']; $price = $row['price']; echo "<p>$item: £$price</p>"; }?>
cart.php4
Final Polishings
cart.php:• Better HTML formatting• Total price of the cart calculated
index.php:• Connected to the database
<?php session_start(); ?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <html><head>
<title>Your title here</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><!--<link rel="stylesheet" type="text/css" href="style.css" />-->
</head> <body> <h1>Your Cart</h1><?php $hostname = 'localhost'; // localhost is the URL of the server $username = 'root'; // the username in this example is root $password = 'elvis'; // put here your MySQL root password // connect to the database server $con = mysql_connect($hostname, $username, $password) or die ('Could not connect: ' . mysql_error()); // display if failed mysql_select_db("test", $con); // choose the test database $cart = $_SESSION['cart']; $action = $_GET['action']; $id = $_GET['id']; if ($action == 'add') { $cart = $cart . ",$id"; $_SESSION['cart'] = $cart; }
$myitems = explode(',', $cart); // explode using comma as a separator
if (count($myitems) <= 1) echo "<p>Your cart is empty.<p>"; else { echo "<table>"; $total = 0; foreach ($myitems as $i) if ($i != '') { $result = mysql_query("SELECT * FROM goods WHERE id = $i"); $row = mysql_fetch_array($result); $item = $row['item']; $price = $row['price']; $total += $price; echo "<tr><td>$item</td><td>£$price</td></tr>"; } echo
"<tr><td><strong>Total</strong></td><td><strong>£$total</strong></td>";
echo "</tr></table>"; }?><p>[<a href="index.php">Home Page</a>]</p> </body></html>
cart.php
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<?php $hostname = 'localhost'; // localhost is the URL of the server $username = 'root'; // the username in this example is root $password = 'elvis'; // put here your MySQL root password // connect to the database server $con = mysql_connect($hostname, $username, $password) or die ('Could not connect: ' . mysql_error()); // display if failed mysql_select_db("test", $con); // choose the test database ?> <html> <head> <title>Your Shop</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <!--<link rel="stylesheet" type="text/css" href="style.css" />--> </head>
<body> <h1>Your Shop</h1> <table> <?php
$result = mysql_query("SELECT * FROM goods");while ($row = mysql_fetch_array($result)){
$id = $row['id']; $item = $row['item']; $price = $row['price']; echo "<tr>";echo "<td>$item</td>";echo "<td>£$price</td>";echo "<td><a href=\"cart.php?
action=add&id=$id\">add to cart</a></td>";echo "</tr>";
};mysql_free_result($result);
?> </table> <p><a href="cart.php?action=show">Show your
cart</a></p> </body></html>
index.php
Other Possible Options
• PHP• ... ???
Other Possible Options
• PHP• ASP.NET• Java• Python• Perl• Ruby on Rails
So, which way to go?
actually, PHPis rarely a good choice!
THE END
How to use studentnet
How to use studentnet
• Your personal website is http://studentnet.kingston.ac.uk/~k01234567(provide your correct k-number)
• To upload files, you will need a FTP client program to send your files to the server.
Here are configuration settings for Filezilla:– Host: studentnet.kingston.ac.uk– Protocol: SFTP– User: k01234567 (your normal k number)– Password: ******** (your normal password)
How to use studentnet• To configure your database:
go to Database Management Tool (link available at the main page http://studentnet.kingston.ac.uk, login with your standard KU knumber and password).
• First time, you will be asked to configure the name of your database and the password – remember them!
• You will then be able to Manage Database. Use your KU k-number and the database password (you created it in the previous point).
• You will find yourself in phpMyAdmin. Use it to create faces table and populate it with data, exactly the same as we did it with XAMPP
How to use studentnet
• Before uploading your application you have to setup the connection for the new server – see the example below (do it for each PHP file that connects to the DB):
$hostname = 'studentnet.kingston.ac.uk'; // URL of the server $username = ‘k01234567'; // replace with your real username$password = ‘elvis'; // your MySQL database password should go here // connect to the database server $con = mysql_connect($hostname, $username, $password) or die ('Could not connect: ' . mysql_error()); // display if connection failed mysql_select_db("db_k01234567", $con); // replace with your real db name
