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Shakespeare In The Matrix - PHP

Now that you've got the basics of PHP variables and operators down, the second article in this series takes a look at PHP's form-processing capabilities, and introduces you to the comparison and logical operators and the "if-else" and "switch" family of conditional statements.

  1. PHP 101 (Part 2) - Shakespeare's Rose
  2. Form...
  3. ...And Function
  4. Operating With Extreme Caution
  5. Shakespeare In The Matrix
  6. If Not This, Then What?
  7. Fortune Smiles
  8. Submitting To The King
  9. Miscellaneous Notes
By: Vikram Vaswani and Harish Kamath, (c) Melonfire
Rating: starstarstarstarstar / 11
August 08, 2000

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In PHP, the simplest form of conditional statement is the "if" statement, which looks something like this:

if (condition) { do this! }
The "condition" here is a conditional expression, which evaluates to either true or false. If the statement evaluates to true, all PHP code within the curly braces is executed; if not, the code within the curly braces is skipped and the lines following the "if" construct are executed.

Let's show you how the "if" statement works by adding a little user authentication to the "login.php4" script above, such that access will be granted only when the user enters the name "neo".

<html> <head> <basefont face="Arial"> </head> <body> <center> <? // check name and print appropriate message if ($name == "neo") { ?> <font face="Arial" size="-1"> Welcome to the Matrix, Neo. <p> May The Force be with you...oops, wrong movie! </font> <? } ?> <? // if password is wrong if ($name != "neo") { ?> <font face="Arial" size="-1"> I wonder if you've heard of Shakespeare, <? echo $name; ?>. <p> He postulated that a rose by any other name would smell just as sweet. <p> Unfortunately for you, I disagree. Access denied. </font> <? } ?> </center> </body> </html>
In this case, the two "if" statements present an appropriate message, depending on whether or not the right password was entered. Of course, PHP also lets you "nest" conditional statements - for example, this is perfectly valid PHP code:

<? if ($day == "Thursday") { if ($time == "12") { if ($place == "Italy") { $lunch = "pasta"; } } } ?>

>>> More PHP Articles          >>> More By Vikram Vaswani and Harish Kamath, (c) Melonfire

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