Coding In Php
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Coding In Php - Presentation Transcript
- PHP – Coding in PHP Harit Kothari [email_address]
- 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 runtime
- 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 Operators
- Decision Making, Flow Control and Loops
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