PHP MySQL Training : Module 3

PHP – Module 3 Hussain Fakhruddin hussulinux@gmail.com

Agenda ● PHP HTML Embedding Tags and Syntax ● Simple PHP Script Example ● PHP and HTTP Environment Variables

PHP HTML Embedding Tags and Syntax ● HTML is written as <tag>content<tag> ● Similarly, PHP Tags can be written as: <?php method; ?> e.g. <?php echo ”Hello World!”; ?> ● So how does it makes sense? - Use different methods to generate contents dynamically - Call PHP functions and get results at run- time

Some other ways to achieve the same ● SGML Style (we have already seen!) <?php echo ”Hello World!”; ?> ● ASP / JSP Style <% echo “Hello World!”; %> OR (Shortcut) <p><?=”Hello World!”; ?> ● (Java)Script Style <script language = “php”> echo “Hello World!”; </script>

Simple PHP Script Example ● A sample program that illustrates different ways to code PHP! <html> <head><title><? Echo “This is a sample PHP page!”; ?></title></head> <body> <h2>A math example</h2> <p>10 + 11 = <%= 10+11 %> <br/>and 8 + 9 = <% echo(8+9); %> </body> </html>

PHP and HTTP Environment Variables ● HTTP as a protocol is different, in PHP it has rich set of Global / environment variables. ● They are accessible globally! ● $HTTP_GET_VARS or $_GET ● $HTTP_POST_VARS or $_POST ● $HTTP_COOKIE_VARS or $_COOKIE ● $HTTP_SERVER_VARS or $_SERVER ● $HTTP_ENV_VARS or $_ENV ● $HTTP_POST_FILES

PHP and HTTP Environment Variables - 1 ● $HTTP_GET_VARS & $HTTP_POST_VARS ● Mostly used in GET and POST requests respectively. ● Contains request information / data. ● Useful in form processing.

PHP and HTTP Environment Variables - 2 ● $HTTP_COOKIE_VARS ● Cookie is a very small, temporary text file ● A way of session management ● Stored and retrieved user specific information on client

PHP and HTTP Environment Variables - 3 ● $HTTP_SERVER_VARS ● Various information about server ● Examples: SERVER_SOFTWARE “wamp” SERVER_NAME “www.sachinism.com” SERVER_PROTOCOL “HTTP/1.1” SERVER_PORT “80” REQUEST_METHOD “POST” QUERY_STRING “nm=hussu+age=32” REMOTE_HOST “hostname_machine” REMOTE_ADDR “192.168.10.1” AUTH_TYPE “basic” CONTENT_TYPE “x-url-encoded”

PHP and HTTP Environment Variables - 4 ● $HTTP_ENV_VARS ● Related to accessing machine and OS specific environment variables ● $HTTP_POST_FILES ● Related to file upload

Summary ● PHP can be written in either of 3 ways, SGML, Script or ASP / JSP styles. ● PHP environment variables like $_GET, $_POST, $_COOKIE, $_SERVER provides access to data stored in different ways like sent as request, stored as cookies, or some data about server.

Whats next? ● Learning language in dept... ● Variables, Constants and Data Types, and Op- erators ● Decision Making, Flow Control and Loops

PHP MySQL Training : Module 3

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