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Download Intro to PHP
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COSC 2328 – Web Programming PHP is a server scripting language It’s widely-used and free It’s an alternative to Microsoft’s ASP and Ruby PHP can run on your ‘Create’ instance Web Server Web Browsers Web pages rendered here from html, css, images and javascript Web Server Software (e.g., Apache) www/cosc2328/*.html /*.php /css/*.css /js/*.js PHP Interpreter MySQL Database Name your file with a .php extension Put the file in your www/cosc2328 folder <?php // PHP code goes here ?> // Many PHP how-to documents show this: <!DOCTYPE html> <html> <body> <?php print “<h1>Hello World!</h1>”; ?> </html> </body> </html> // For this class, do this instead: <?php print “<!DOCTYPE html>\n”. “<body>\n”. “ <h1>Hello World!”</h1>\n”. “</body>\n”. “</html>”; ?> PHP superglobals $_GET and $_POST are used to collect form data When the user fills out the form and clicks the ‘submit’ button, the form data is sent to the PHP file for processing The form data is sent with an HTTP Post or HTTP Get You designate whether to use Get or Post in your web page where you define the form Hypertext Transfer protocol (http) is designed to enable communications between clients and servers http works as a request response protocol between a client and a server A web browser may be a client and an application on a web server may be the server Example: A client (browser) submits an http request to a server (web server) and the server does some work and returns a response Can be bookmarked Remains in browser history Should never be used with sensitive data Passes data in the Uniform Resource Locator (URL is a reference address to a resource on the Internet) Domain PHP File Name Name | | http://foo.com/bar/baz.php?name1=value1&name2=value2 | | Protocol Directory Name Value Pairs Passed To PHP Script (Query String) Does not remain in browser history Cannot be bookmarked Has no restrictions on data length The query string (name/value pairs) is sent in the http message body of the post request; not in the URL POST /test/demo_form.php HTTP/1.1 Host: foo.com name1=value1&name2=value2 http://www.jbryan2.create.stedwards.edu/co sc2328/inClass1.html http://www.w3schools.com/php/
