![I Do Like the Explode Function – Good for csv $sequence = “A,B,C,D,E,F,G”; $elements = explode (“,”,$sequence); // Now elements is an array with all substrings between “,” char echo $elemets[0]; // output: A; echo $elemets[1]; // output: B; echo $elemets[2]; // output: C; echo $elemets[3]; // output: D; echo $elemets[4]; // output: E; echo $elemets[5]; // output: F; echo $elemets[6]; // output: G;](https://image.slidesharecdn.com/building-an-ecommerce-site-with-php1019/85/Building-an-e-commerce-site-with-PHP-20-320.jpg)
![Arrays $books = array( ”Enduring Love”,”The Child in Time”,”The Cement Garden”); for ($i=0; $i < count($books); $i++) print ($i+1).”: $books[$i]”;](https://image.slidesharecdn.com/building-an-ecommerce-site-with-php1019/85/Building-an-e-commerce-site-with-PHP-21-320.jpg)
![Arrays As a Key->element Mapping $students = array( 0=>”Mike”, 1=>”Bill”, 2=>”Fred”, 3=>”Ann”) echo $students[2]; Fred Echo $students[“Fred”]; 2 In other words PHP arrays are associative](https://image.slidesharecdn.com/building-an-ecommerce-site-with-php1019/85/Building-an-e-commerce-site-with-PHP-22-320.jpg)
![More on Array Maps $books = array(”Enduring Love”=>1,” The Child in Time”=> 2,” The Cement Garden”=>3); while ($item = each( $books )) print $item[“value”].” : ”.$item[“key”]; 1 : Enduring Love 2 : The Child in Time 3 : The Cement Garden](https://image.slidesharecdn.com/building-an-ecommerce-site-with-php1019/85/Building-an-e-commerce-site-with-PHP-23-320.jpg)
![Executing Database Queries <?php $query = "SELECT name, age, phone FROM students WHERE (name LIKE '%Smith%')"; //execute query $result = mysql_execute($query); while($row = mysql_fetch_array($result)) { echo($row[“name”].”, “); echo($row[“age”]); } ?> WOW! That was Easy!](https://image.slidesharecdn.com/building-an-ecommerce-site-with-php1019/85/Building-an-e-commerce-site-with-PHP-25-320.jpg)
Building an e:commerce site with PHP
- 1. Server-side Technology Dave Elliman
- 2. To Implement Megagamez’s Web Site: We need to build shopping trolley contents in a database We need to keep track of our customers and orders We will use MySQL and PHP to do this
- 3. Client-side and Server-side Scripting Client-side Javascript VBScript (MS) Can be used to validate input Can implement mouse-over effects etc Server-side cgi PHP ASP ASP.NET JSP Perl & Ruby – these ugly sisters will not be studied in ELC Communicates with database Application logic
- 6. There Are Two Worlds Apache/Open Source PHP JSP J2EE Servlets Linux Servers MySQL DB ASP possible with Chillisoft (now Sun ASP) Microsoft IIS ASP, ASP.NET Windows 2000 Server Write in C# MS SQL Server 2000 Develop with Visual Studio .Net
- 7. Which World Is Best? Open Source Free or nearly so Cheap hosting Excellent Performance May need to spend money to make scalable (JBOSS free) Development tools OK but the best ones not free Microsoft Expect to spend £10,000 on software Hosting expensive Excellent Performance – more scalable Compelling ease of development
- 8. Megagamez Has Only £70 in the Bank We will use for Apache/MySQL/PHP We will design our database tables We will design our security idea We will make it work First of all let’s understand PHP
- 9. PHP History 1994: Created by Rasmis Lesdorf, a software engineer in Apache Team 1995: Called Personal Home Page Tool 1997: used by 50,000 web sites 1998: used by 100,000 websites 1999: used by 1,000,000 websites 2002: 30% of Web sites uses PHP
- 11. PHP Is Open-source Easy to use but not pretty Stable and fast Runs on all platforms Supports all databases Has some useful libraries Pre-installed in Linux distributions
- 12. How It Works Cache of compiled pages
- 13. Or in Words… The Client from browser sends an HTTP request (with POST/GET variables) Apache recognizes that a PHP script is requested and sends the request to PHP module The PHP interpreter executes the PHP script and returns the script output Apache replies to client using the PHP script output interspersed with HTML output
- 14. “Hello World” in PHP <html> <head> <title>My personal Hello World! PHP script</title> </head> <body> <? echo “Hello World!”; ?> </html>
- 15. How Do You Run It? See: http://www.cs.nott.ac.uk/TSG/manuals/webpages/php/ #!/usr/local/bin/php // 1 st line of script mkdir ~/cgi-bin chmod 711 ~/. ~/cgi-bin (sorry!) chmod 755 *.php URL is http:// robin.cs.nott.ac.uk/~<you>/cgi-bin/test.php
- 16. Using Variables Variables start with a $ The assignment operator is = No need to declare variables Variables type is implicit No check on variable used before it is assigned Arrrrrrrrrgh… Reminiscent of BASIC - for the cowboys? (wja says so)
- 17. An Example A string is a sequence of characters in quotes for example “This is a String” and ‘so is this’ A string can be assigned to a variable: $Homer = “The next president” $Homer = ‘The next president’ Both work…
- 18. Substitution in Strings $age = 37 $Homer = “Mr Simpson is $age” $Homer is Mr Simpson is 37 This does not work in single quotes Which would come out as: Mr Simpson is $age
- 19. This Is Slightly Scary to Me $A = 1; $B = “2”; $C = ($A + $B); // Integer sum $D = $A . $B; // String catenation echo $C; // prints 3 echo $D; // prints 12
- 20. I Do Like the Explode Function – Good for csv $sequence = “A,B,C,D,E,F,G”; $elements = explode (“,”,$sequence); // Now elements is an array with all substrings between “,” char echo $elemets[0]; // output: A; echo $elemets[1]; // output: B; echo $elemets[2]; // output: C; echo $elemets[3]; // output: D; echo $elemets[4]; // output: E; echo $elemets[5]; // output: F; echo $elemets[6]; // output: G;
- 21. Arrays $books = array( ”Enduring Love”,”The Child in Time”,”The Cement Garden”); for ($i=0; $i < count($books); $i++) print ($i+1).”: $books[$i]”;
- 22. Arrays As a Key->element Mapping $students = array( 0=>”Mike”, 1=>”Bill”, 2=>”Fred”, 3=>”Ann”) echo $students[2]; Fred Echo $students[“Fred”]; 2 In other words PHP arrays are associative
- 23. More on Array Maps $books = array(”Enduring Love”=>1,” The Child in Time”=> 2,” The Cement Garden”=>3); while ($item = each( $books )) print $item[“value”].” : ”.$item[“key”]; 1 : Enduring Love 2 : The Child in Time 3 : The Cement Garden
- 24. Connecting to a Database <?php //connect to database $conn=mysql_connect(“sauron.cs.nott.ac.uk",“usr",“pwd") or die(“could not connect to database “.mysql_error()); mysql_select_db(“megagamez”) or die(“message”); // do something ……… //disconnect from database mysql_close($conn); ?>
- 25. Executing Database Queries <?php $query = "SELECT name, age, phone FROM students WHERE (name LIKE '%Smith%')"; //execute query $result = mysql_execute($query); while($row = mysql_fetch_array($result)) { echo($row[“name”].”, “); echo($row[“age”]); } ?> WOW! That was Easy!
- 26. You Will Want More Control Over the Format – So Make a Table <table width="75%" border="1" cellspacing="1" cellpadding="1" bgcolor="#FFFFFF"> <tr bgcolor="#CCFFFF"> <td height="22"><b>Name</b></td> <td height="22"><b>Age</b></td> <td height="22"><b>Telephone</b></td> </tr> … some php stuff </table>
- 27. What About Inserting Data? I cannot do better than the excellent tutorial which makes a web site of jokes: http://www.zend.com/zend/tut/tutorial-yank.php
- 28. Learning More About PHP Try http://www.php.net/manual/ Books: O’Reilly Press, Web Database Applications with PHP and MySQL Hugh E Williams , David Lane
- 29. Learning More About PHP You may prefer