PHP: Hypertext Preprocessor Greg Lowe Rob White Brian Wright Mike Zywiec

Introduction PHP stands for “PHP: Hypertext Preprocessor” Server-side scripting language Syntactically similar to C Utilized by approximately 33% of web domains on the web

History 1995 – Rasmus Lerdorf wrote the Personal Home Page/Form Interpreter: PHP/FI Wanted to create a HTML-centric language as opposed to PERL which was PERL-centric Code was inside the HTML document and written within Tags Example: Hey, you are using Netscape! Hey, you are using Netscape! <!--endif-->

History Lerdorf was not satisfied with PHP/FI so he wrote PHP/FI v.2 Embedded commands within tags Same syntax used today

History 1997—Zeev Suraski and Andi Gutmans contacted Lerdorf in an effort to combine their already written engine with PHP/FI v.2 After agreeing, the three and some others finished the release of PHP v.3 PHP v.3 gained: Limited Object Oriented Support Limited Object Oriented Support More speed More speed Numerous DB support (MySQL, ODBC, Oracle, …) Numerous DB support (MySQL, ODBC, Oracle, …) Extensibility Extensibility Allowed for programmers to write their own modules for the language

History Zeev and Andy went to work on what is now called the Zend Engine The Zend Engine + PHP v3 = PHP4(2000)

History PHP v Better Objected Oriented Support Better Objected Oriented Support Better Error Checking Better Error Checking Java Style try{} catch{} SimpleXML SimpleXML Easy interaction with XML Documents

Installing PHP Web Environment Command Line Interface

Command Line PHP Scripting Can execute code from command line in three ways: Executing file Executing file Code from command line Code from command line Passed code from standard input Passed code from standard input

Advantages of CLI Installation Same code can work on Unix or Windows machines ‘#!/usr/bin/php’ ‘#!/usr/bin/php’ Web-independent development

For Server-Side Scripting Prepackaged solutions Manually compiling & configuring Works for Apache 1.3.x/2.0, IIS

Known Issues IIS Delicacy (Security) Delicacy (Security)Apache 2.0 (Thread safety, high-traffic areas) 2.0 (Thread safety, high-traffic areas)

PHP Strengths: Ready to use tools to interface with many databases and web utilities. (MySQL, Oracle, Etc.) Easily extensible. PHP is modular and it is simple to create utilities to extend the capabilities of the language. PEAR project (

PHP Strengths: Server Side processing No client side software

PHP Weaknesses: Weakly typed variables. Poor error detection / warning. Really only suitable for web applications.

PHP <?php // Print a greeting if the form was submitted if ($_POST['user']) { print "Hello, "; // Print what was submitted in the form parameter called 'user' // Print what was submitted in the form parameter called 'user' print $_POST['user']; print "!"; } else { // Otherwise, print the form print <<<_HTML_ Your Name: Your Name: <br/> _HTML_; _HTML_;}?>

PHP Your Name: Your Name: <br/> </form> Then when I click on enter the returned information is: Hello, greg! Example-1-05.php

PHP require 'DB.php'; $db = if (DB::isError($db)) { die("connection error: ". $db->getMessage( )); } // Eggplant with Chili Sauce is spicy $db->query("UPDATE dishes SET is_spicy = 1 WHERE dish_name = 'Eggplant with Chili Sauce"); WHERE dish_name = 'Eggplant with Chili Sauce"); // Lobster with Chili Sauce is spicy and pricy $db->query("UPDATE dishes SET is_spicy = 1, price=price * 2 WHERE dish_name = 'Lobster with Chili Sauce'"); WHERE dish_name = 'Lobster with Chili Sauce'");

PHP <?php print 'strftime() says: '; print strftime('%c'); print "\n"; print 'date() says:'; print date('r'); ?>1example-9-01

PHP <?php function page_header2($color) { print ' Welcome to my site '; print ' Welcome to my site '; print ' '; print ' ';}page_header2('cc00cc');}?>1example-5-04.php

PHP Example-A-03.php

PHP