1. PHP Overview PHP: Hypertext Preprocessor Server-Side Scripting
Code also included with HTML
Pre-processed on server
Browser gets only HTML and client-side code
More secure than JavaScript
More powerful than JavaScript
File access, database access, etc.
Less efficient than JavaScript for interactive features
Must “go back” to the server
When not doing JavaScript, just refer to the behaviors we’ve seen in lab.

2. PHP Overview Open source software Free, users can add features
E.g., phpMyAdmin, DBMS connectivity
Evolving documentation (
Competitors
Active Server Pages (Microsoft)
Java servlets and JSP (Sun)
Cold Fusion (Macromedia)

3. PHP Overview Summary Secure method for Processing form data
More extensive calculations, manipulations possible
Selective display of database data
Updates, deletions from databases
Separating content from design
Keeping track of information from one web page to another
ing information
Validating users (logins, privileges, etc.)
Etc.

4. PHP Overview Basic examples Output Variables and assignment
Use of built-in functions (and php.net)
User-written functions
Control structures
Processing form input
Processing querystring input
POST and GET methods
Session variables

5. PHP Overview Two DB examples (quick look first)
Try it
Two DB examples (quick look first)
List all customer information from database
Design:
Connect to the DB server
Select the DB we want to use (“CS19”)
Get the Customer information from the DB
Display it using HTML
Disconnect from the DB
Note: Compare to the steps we use to directly connect to the DB using phpMyAdmin

6. PHP Overview Connect to the DB server and select the DB “CS19”
include ("/home/ktreu/aux/common_db.inc");
$linkID = mysql_connect("localhost",$dbusername,$dbuserpassword)
or die ("Could not connect: " . mysql_error());
mysql_select_db("CS19", $linkID)
or die ("Unable to select db: " . mysql_error());
Notes: php delimiter, variables, including external files, error checking

7. PHP Overview
Get the list of Customers from the DB
$SQL = "SELECT * FROM Customers ORDER BY name";
$allValues = mysql_query($SQL, $linkID);
if (!$allValues) {
echo "Could not successfully run query ($SQL) from DB: " . mysql_error();
exit; }
Notes: use of SQL, possibility of multiple links to DB server, built-in MySQL functions, error checking, contents of $allValues

8. PHP Overview
echo "<h4>All Customers Ordered by Last Name</h4>";
echo "<TABLE BORDER=1 CELLPADDING=8>";
echo "<TR><TD><B>Customer Number</B></TD><TD><B>Name</B></TD><TD><B>Phone</B></TD>";
while ($thisValue = mysql_fetch_array($allValues)) {
echo "<TR>";
echo "<TD>" . $thisValue["custnum"] . "</TD>";
echo "<TD>" . $thisValue["name"] . "</TD>";
echo "<TD>" . $thisValue["phone"] . "</TD>";
echo "</TR>"; }
echo "</TABLE>";
mysql_close($linkID);
?>
Notes: printing HTML, looping, accessing each record from the query one by one, closing the connection

9. PHP Overview What changes would be needed to get different data?
List all Product information?
List all products sold in March with the name of the customer who purchased them?
Etc.

10. PHP Overview Another example (quick look)
Try it
Another example (quick look)
List all customer information from database for a specific customer
Design:
Get the desired customer number from the user
Connect to the DB server
Select the DB we want to use (“CS19”)
Get the information for the customer with the desired customer number from the DB
Display it using HTML
Disconnect from the DB

11. PHP Overview Notes: method and action attributes of the form
Write a form to get the customer number
<form method="post" action="listCustomersByCustnum.php">
Please enter a Customer Number:
<input type="text" name="custnum" length="4" maxlength="4">
<br>
<input type="submit" value="Click for Customer Info">
</form>
Notes: method and action attributes of the form

12. PHP Overview
Only two changes necessary in the PHP code
$custno = $_POST['custnum']; …
$SQL = "SELECT * FROM Customers WHERE custnum=$custno";
$allValues = mysql_query($SQL, $linkID);
if (!$allValues) {
echo "Could not successfully run query ($SQL) from DB: " . mysql_error();
exit; }
Notes: Accessing the form data, using it in a query, significance of double quotes

13. Additions
Edit
Delete
Insert
Admin functions
Other tips and tricks