IT som værktøj Bent Thomsen Institut for

Input • So far we have only talked about output • PHP can input

HTML Forms • HTML forms are just about the only way for PHP to

In “that. php” <? PHP Print(“$variable 1, $variable 2 ”); ? > • “that.

Other Form Elements • Radio Buttons What is your favourite pet? <input type=“radio” name=“favourite_pet”

" src="https://present5.com/presentation/98e6e22b4896ceb9b5a29093b4c0c9a9/image-6.jpg" alt="Continue … • List box example: • The above creates 2 text boxes and anything that is type into the 1 st text box will be assigned to variable 1; anything that is enter into the 2 nd textbox is assigned to variable 2. These variables are then sent to the PHP script “that. php” for processing. November 2003 Bent Thomsen - FIT 6 -2 3

In “that. php” <? PHP Print(“$variable 1, $variable 2 ”); ? > • “that. In “that. php” • “that. php” will output the information that is associated with the 2 text boxes. November 2003 Bent Thomsen - FIT 6 -2 4

Other Form Elements • Radio Buttons What is your favourite pet? Termite Cockroach • Checkboxes What magazine are you currently subscribed to? Termite World Cockroach’s Day • What is/are the variable(s) and the assigned value(s)? November 2003 Bent Thomsen - FIT 6 -2 5

" src="https://present5.com/presentation/98e6e22b4896ceb9b5a29093b4c0c9a9/image-6.jpg" alt="Continue … • List box example: • Note the variable hob[]. In this case, an array will be sent to a PHP script. Values can be accessed through array indexing. November 2003 Bent Thomsen - FIT 6 -2 6

Cookies <? php if (!$myname) { print Cookies n"; print "n"; print ""; exit; } setcookie("myname", $myname); ? > November 2003 Bent Thomsen - FIT 6 -2 7

Your name: Your name: Form Handling again • A simple form:

• The form handling code: Hi . You are years old. November 2003 Bent Thomsen - FIT 6 -2 8

Form Handling • Global Variables, $HTTP_GET_VARS, $_GET, register_globals configuration Hi . You are years old. November 2003 Bent Thomsen - FIT 6 -2 9

More Global Variables Variable Name Description $DOCUMENT_ROOT Your Web server's base directory with user-visible files. $REQUEST_METHOD The HTTP method used to access this page, for example GET or POST. $REQUEST_URI Full local part of the request URL, including parameters. $HTTP_GET_VARS An associative array with the GET parameters passed to PHP, if any. $HTTP_POST_VARS An associative array with the POST parameters passed to PHP, if any. $HTTP_COOKIE _VARS An associative array with the cookies passed by the browser, if any. $SCRIPT_FILENAME File name of the top-level page being executed. $SCRIPT_NAME Local URI part of the page being executed. $SERVER_ADMIN Server administrator's email address. $SERVER_NAME Domain name for the server. $SERVER_PORT TCP port number the server runs on. $SERVER_PROTOCOL Protocol used to access the page, for example "HTTP/1. 1". November 2003 Bent Thomsen - FIT 6 -2 10

File Access • Local File Access – fopen, fread, fwrite, fclose, fputs, freads, feof, much more… • Remote File Access – Uses the same functions as local file access – Uses URL’s to retrieve files, FTP and HTTP supported. – Can write files to FTP is username and password is sent • ftp: //username: [email protected] com/path/filename November 2003 Bent Thomsen - FIT 6 -2 11

Example <? php $visitors = 0; // Initialize the visitors to zero $fr = Example November 2003 Bent Thomsen - FIT 6 -2 12

$Authentication <? function authenticate() { global $PHP_AUTH_USER; global $PHP_AUTH_PW; if(!($PHP_AUTH_USER == “user$ Authentication November 2003 Bent Thomsen - FIT 6 -2 13

PHP and SQL Databases • Wide range of SQL database supported – My. SQL, Postgre. SQL, MS-SQL, Oracle, Sybase, ODBC, DBM, Informix… – Native interfaces (My. SQL, etc), and abstracted interfaces (ODBC, dba, PEAR) – Persistent connections supported November 2003 Bent Thomsen - FIT 6 -2 14

My. SQL <? php $conn = mysql_pconnect(“localhost”, “username”, “password); mysql_select_db(“mydatabase”, $conn); $res = mysql_query($conn, My. SQL November 2003 Bent Thomsen - FIT 6 -2 15

Postgre. SQL <? // database access parameters -- alter this as per your configuration Postgre. SQL

// if records present if ($rows > 0) { // iterate through resultset for ($i=0; $i<$rows; $i++) { $row = pg_fetch_row($result, $i); ? >

No data available. November 2003 Bent Thomsen - FIT 6 -2 17

ODBC <? // connect to a DSN ODBC November 2003 Bent Thomsen - FIT 6 -2 18

Putting it all together Web-Client HTML-Form (+Java. Script) Reply November 2003 Web-Server Call PHP interpreter Submit Data Web-Browser PHP Script WWW Response Database Server Response Bent Thomsen - FIT 6 -2 LAN DBMS SQL commands Database Output 19

Going Mobile with WAP • WAP: Wireless Application Protocol – Facilitates communication between a wireless device and a gateway, which in turn allows communication with Internet- or intranet-based resources • WML: Wireless Markup Language – Derivative of XML used to create pages for wireless devices • WAP application can be built using PHP November 2003 Bent Thomsen - FIT 6 -2 20

Compelling WAP applications • Brief data that users want available while mobile – – – Flight, directions, and traffic information Movie listings News Weather Reading email Controlling “things” – house, industrial plants, … • Key today: application must provide high value with a minimum of typing • Eventually: location-based services November 2003 Bent Thomsen - FIT 6 -2 21