Website Development

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Website Development Management
CIT 3353 -- Fall 2005 www.clt.astate.edu/jseydel/m
is3353

• Elementary Exercises with PHP

Instructor John Seydel, Ph.D.
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Student Objectives

• Upon completion of this class meeting, you
  should be able to
• Set up root directory for Apache localhost
• Work with user-defined local variables
• Recognize PHP superglobals
• Use various operators in PHP
• Apply some simple PHP functions

3
Lets Do Some Reorganizing

• Open up IE to http//localhost
• Should display standard Apache start page
• Shows if no index.html exists in the root
  directory
• Open up Windows Explorer to the Apache default
  root directory
• C\Program Files\Apache Group\Apache2\htdocs
• Create a subdirectory OriginalFiles
• Move all existing files into OriginalFiles
• Copy all files from webroot directory in My
  Documents into htdocs
• Create a desktop shortcut to htdocs
• Refresh your browser window
• Your index.html should now display
• If none, then a directory listing should display

4
An Exercise Interest Compounding

• Refer to the handout
• Now PHP standalone page (compound.php)
• Later Form page enhancement (compound.html)
• Open PHP Designer
• Close all PHP Designer windows
• Set options
• Create new PHP document
• Apply XHTML DTD and modify
• Create multi-line document type declaration
• Add xmlns attribute to lthtmlgt tag
• Create the PHP script to write the XML
  declaration test the page
• Create the PHP script for variable assignments
  test the page
• Write the HTML (without PHP) to form the body
  test the page
• Add the PHP scriptlets to complete the body test
  the page
• Post to the SuSE1 server (/exercises) and test
  the page

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Variables Constants

• User-defined variables
• Local exist only within given procedure
• Global must be declared
• PHP superglobals
• _POST . . .
• _GET . . .
• _COOKIE . . .
• _SESSION . . .
• Constants
• Essentially are variables that cannot be changed
  once theyre defined
• Require declaration using define() function

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Typical PHP Operators

• Arithmetic - /
• Concatenation .
• Assignment
• -
• .
• Comparison ! gt lt gt lt
• Logical

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Enhancing the Application

• We need a form page to serve as a front-end
• Create a new file, compound.html
• Use PHP Designer
• Follow the code in the handout
• This will be the form that provides the values
  assigned to the variables
• Were thus making the compounding calculator
  dynamic

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Now, the Form Processor

• Open compound.php and save as compound_proc.php
• Insert the following between lines 4 and 5
• dblYears _POST'txtTerm'
• dblInterest _POST'txtIntRate'
• if ((dblYears lt 0) (dblYears gt100))
• header("Location compound.html")
• Now, submit the form (compound.html)
• First with reasonable data
• Then without data
• Comment out original variable assignments
• Use // for single lines
• Or use / . . . / for multiple lines
• Post to the SuSE1 server

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A Review of Todays Concepts

• Variable naming
• Naming start with and use correct prefix
• Types int, dbl, str
• Commenting PHP code
• PHP functions print(), echo(), pow(), define(),
  header()
• PHP superglobals _POST . . .
• Operators
• Arithmetic
• Assignment .
• Logical
• Control structures selection (if)
• Using the escape designator \

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Summary of Todays Objectives

• Set up root directory for Apache localhost
• Work with user-defined local variables
• Recognize PHP superglobals
• Use various operators in PHP
• Apply some simple PHP functions

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Appendix
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Structure for Websites (Server)

• www.SuSE1.AState.edu
• index.html
• exercises.html
• /images
• LogoASU.gif
• . . .
• /exercises
• /chapter4
• errorscript.php . . .
• firstscript.php
• phptag.php
• . . .
• /chapter5
• . . .

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Structure for Local Disks

• C\Documents and Settings
• \sstudent
• \My Documents
• \sstudent
• index.html
• exercises.html
• \images
• LogoASU.gif
• . . .
• \exercises
• \chapter4
• errorscript.php . . .
• firstscript.php
• phptag.php
• . . .
• \chapter5
• . . .

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Some Guidelines for Source Code

• Use lowercase for tags attributes
• Quote attribute values
• Use relative references for resources on same
  server
• Always use closing tags
• Nest elements properly close in reverse order of
  opening
• Use indentation consistently and to make code
  readable
• No more than 80 characters per line of code
  break long tags into multiple lines, typically
  one per attribute
• Avoid deprecated elements, e.g., ltfontgt, ltigt, ltbgt
• Use no spaces in file names
• Treat all URLs and other resource names as if
  case-sensitive

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Browser/Server Interaction