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IST 221 Internet Concepts and Applications

IST 221 Internet Concepts and Applications. Introduction to PHP. PHP, Hypertext Preprocessor. A Server side HTML embedded scripting Language. An Alternative to perl-CGI, ASP, JSP and Cold Fusion. PHP is similar to Javascript, but on the server side. PHP Syntax.

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IST 221 Internet Concepts and Applications

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  1. IST 221 Internet Concepts and Applications Introduction to PHP

  2. PHP, Hypertext Preprocessor • A Server side HTML embedded scripting Language. • An Alternative to perl-CGI, ASP, JSP and Cold Fusion. • PHP is similar to Javascript, but on the server side.

  3. PHP Syntax • The syntax and semantics of PHP are closely related to the syntax and semantics of JavaSscript and Perl • PHP uses dynamic typing. • PHP variable names are case sensitive • PHP tag: <?php …… ?> • Comments: # , // and /*…..*/

  4. PHP Primitives • Variables: Integer, Double, String and Boolean. • String literals are defined with either single(‘) or double (“) quotes. • ‘The sum is : $sum’ • “The sum is : $sum” • Which format would take \n, the new line character? • Variable names in PHP must start with a dollar sign and follow by a letter or an underscore.

  5. PHP- Arrays • Array names have the same format and restriction as variable names • Use keyword: array to construct an array • $courses = array(‘perl’, ‘php’, ‘Java’, ‘Javascript’); • print $courses[1]; • Associative arrays (Hashes in Perl) are defined in a similar fashion. • $kids_age = array (‘John’=> 4, ‘Mary’=>6); • print $kids_age[‘John’];

  6. PHP- output • Any output from a PHP script becomes part of the HTML document the PHP processor is building. • print • Print “Welcome to my home page<br/>”; • echo • echo “Apples are red <br/>”, “Bananas are yellow <br/>”; • printf (Similar to the printf in C language)

  7. PHP – Control Statements • Relational operators & Boolean operators >, >=, ==, !=, ===, and, &&, or, ||. • if - elseif – else if ( $first== $second) {statement(s);} elseif( $first== $third) {statement(s);} else {statement(s);} • for for ( $count=1; $count <=; $count++ ) {loop statement(s);} • while, do-while, switch are similar to JavaScript.

  8. Exercise 12-1 First PHP program • Prepare the folder for storing PHP programs • Create a folder: public_php paralleled to your public_html folder in your AFS (S:) Drive • Assign “read” permission to your public_php folder • Telnet to you afs account Start, Run, Open: telnet • At the Microsoft Telnet prompt type o gpunix.umr.edu • Login with your id and password. Hit enter twice until you reach the gpunix prompt • Type the following command at the prompt fs setacl public_php system:anyuser read • Logout and close the telnet program

  9. Exercise 12-1 First PHP program • Create your first PHP program • Open up Notepad ( You may use Dreamweaver to create a new php dynamic page) • Type in the following php code. (In Dreamweaver, eliminate all the initial tags first) <?php # This program prints out a simple message print ("My first PHP program "); ?> • Save this file as ex12_1.php under S: public_php/ • if you are using notepad, make sure to select All files from the “Save as type” dropdown list • Open up a browser and type the following URL to access the file http://acmphp.cs.umr.edu/~<your_username>/ex12-1.php • Be sure to replace <your_username> with your id

  10. Exercise 12-2 Second PHP program • Create your second PHP program • Type in the following php code. <html> <head> <title> Generating HTML From PHP</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body> <h1>Generating HTML from PHP</h1> <?php print ("Using PHP has <i>some advantages:</i>"); print ("<ul><li>Speed</li><li>Ease of use</li> <li>Functionality</li></ul>"); print ("</body></html>");

  11. Exercise 12-2 Second PHP program • Note that this code may look like an html but it is actually an html embedded php. • Save this file as ex12_2.php under S: public_php/ • Open up a browser and view this php file from http://acmphp.cs.umr.edu/~<your_username>/ex12-2.php Add two hyper links for exercises ex 12_1 and ex 12_2. Label the link as First and second PHP exercises

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