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ADVM420- Class #1Web Design with PHP
and MySQL
Introduction to PHP
© Copyright 2007 Grant Macewan Collegehttp://liftedu.wordpress.com
Micah Slavens - [email protected]
Introduction Course Title
Web design with PHP and MySQL Objectives
Build dynamic, data-driven websites Gain the skills to learn and move forward
Target Audience Some knowledge of HTML, databases, & programming is
recommended Facilities
Washrooms, cafeteria, parking Introductions and Interests
What brought you to this course?
Target Environments
Client Machine requirements: Text Editor FTP
Server requirements: Can be Windows/Mac/Linux based Download & install appropriate software See reference
Installing PHP & MySQL on http://liftedu.wordpress.com/resources/
Agenda Day 1:
Web development concepts Tools of the trade HTML review Introduction to Scripting with PHP Include files HTML Forms & Validation
Day 2: Listing data from MySQL Adding data to MySQL Creating Web applications Wrap-up
Web Development Concepts
What is a Web Server? What is a Web Client? Static Web Pages
HTML only Dynamic Web Pages
HTML with Scripting language
Dynamic Web Pages
Client Side AJAX – (Asynchronus Javascript & XML) DOM Scripting Flash
Server Side Pre-processor that generates HTML Numerous scripting languages available
PHP, Python, Ruby, ASP, ColdFusion, JSP, Perl, etc…
Server-Side Technology Advantages
Ability to store data long term Code is protected
Code logic is only visible through FTP (login protected) Potentially faster download times
Code does not travel to client - public only sees results
Disadvantages More load on server Server must support technology Less portability More knowledge required
Development Strategies
Develop locally / upload to server Does not require permanent connection Can use your own resources (but you have
to manage them) Does not interfere with existing site More control if things go wrong…
Develop directly on a server via FTP You’ll be sure it works Easier in a team environement
Tools of the Trade
We will be developing code on our server using a text Editor
There are tools that will write blocks of code for you, but a text editor will give you a greater understanding of what you’re doing
We won’t look at installing PHP or MySQL in class, but you’re welcome to give it a try on your own computer at home
XHTML Review Using Text Editor, create
An index.html page 2 directories, called:
/images /documents
Heading Image (linked to in image directory) An unordered list
Links to your 3 favorite sites An ordered list
Steps to making a pb & j sandwich Save View
Web Standards W3C
Standards make a better internet A usable standards based site will have a greater
return No tables based designs! Semantic markup is beautiful
Use only XHTML elements Make use of all the elements you can
Clean markup and CSS will make a lighter, more usable application
Basic PHP Rules
PHP script files end with the .php extension Scripting statements are enclosed in tags:
<?PHPprint (date("M d, Y"));
?> More simply:
<? print (date("M d, Y")); ?>Or<?= date("M d, Y") ?>
Try it! Rename your file index.php and include the lines
shown above to show the server’s date
Data types in PHP
PHP is four simple data types: Number (1, -5, 22.35, 1000000) String (“My dog”, “123 Any Street”) Boolean (true/false) Null
Compound data types: Array $age[‘Bill’] = 15; $car[1] = “Ford”; Object
Variables and Statements
Statements end with the semi-colon ; Capitalization is important! Variable names always prefixed with $ Comments begin with //
$x = 15 / 9; //line1 comment
$y = (65 * $x) % 15; //line2 comment
PHP Operators
Math operators: + - * / % (Remainder)
String operator: . (Concatenation)
Comparison operators && AND || OR ! NOT
Program Output
As we have seen, all output to the browser window is done using the print() or echo() functions (you can include html):
<?PHP
$x = 15 / 9; //comment
$y = (65 * $x) % 15;
print(“<h2>The answer is: $y </h2>”);
?>
Self-test: Simple Statements
Write a program in PHP that calculates and displays a 10% discount on $199.99.
Ensure all output has labels and make it appear on separate lines.
Program Blocks
Program blocks are always contained in braces {…}
if () {…} else {…}
switch() {…}
while() {…}
do {…} while()
for(;;) {…}
function xyz() {…}
Decisions: if() {…} else {…}
Syntax:if (condition) {
true_statements;}else {
false_statements;}
Example:if ($x >= 10) {
$x = $x * 0.9; //discount 10%}else {
$x = $x * 0.95; //discount 5%}
Self-test: if() {…} else {…}
Write a program in PHP that prints the words:
“infant” if the variable $age is less than 1 “toddler” if the variable $age is less than 2 “child” if the variable $age is less than 13 “teen” if the variable $age is less than 18 “adult” otherwise
Decisions: switch () {…}
Syntax:switch (value) {
case N: statements; break; … default:
statements; break;}
Example:switch ($month) {
case 1: print (“Jan”); break;
case 2: print (“Feb”);
break;default:
print (“Err”);break;
}
Self-test: switch () {…}
Write a program in PHP that displays: “BMW200” if the variable $car is 200 “BMW203” if the variable $car is 203 “BMW205” if the variable $car is 205 “Error” otherwise
Loops: while() {…}
Syntax:while (condition) { statements;}
Example: What does this program do?$i = 0;$s = 0;while ($i < 7) { $s = $s + $i; $i = $i + 1;}print(“s= $s <br>\n”);
Self-test: while() {…}
Powers of Two Write a program that displays the series
2,4,8,16,32,64… until the number becomes greater than 5000.
Loops: do {…} while()
Syntax:do { statements;} while (condition);
Example: What does this program do?$i = 0;do { print(“i=“ . $i . “<br>\n”);} while ($i != 0);
do {…} while() always runs at least once.
Loops: for(;;) {…}
Syntax:for (initialize; condition; increment) { statements;}
Example: What does this program do?$f = 1;for ($i=1; $i<=5; $i++) { $f = $f * $i;}echo(“f=“ . $f . “<br>\n”);
Self-test: for(;;) {…}
Countdown Write a program that displays 10,9,8,…1
Blast Off! using a for loop.
function xyz() {…}
Example:function xyz($arg1,$arg2,$arg3) {
$answer = ($arg1+$arg2) / $arg3;
return ($answer);
}
//calling the function…
$r = xyz(1,2,3);
print($r);
Self-test: function xyz() {…}
weekdayName() Write a function returns the name of the week
depending on the argument passed, for example: If 0 is passed, print “Sunday” If 1 is passed, print “Monday” … If 6 is passed, print “Saturday”
Call this function with each day of the week and display the return value.