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Miscellaneous Notes - 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.

TABLE OF CONTENTS:
  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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The === operator
------------------------

As we've mentioned above, PHP4 introduces the new === operator to test whether variables are of the same type. Here's an example:


<? if (!$submit) { // if $submit doesn't exist, it implies that the form // has not yet been submitted // so display the first page ?> <html> <head> <style type="text/css"> td {font-family: Arial;} </style> </head> <body> <form method="GET" action="cookie.php4"> <table cellspacing="5" cellpadding="5" border="0> <tr> <td align="center"> Gimme something! </td> <td align="right"> <input type="text" name="yin"> </td> </tr> <tr> <td align="center"> Gimme something else! </td> <td align="right"> <input type="text" name="yang"> </td> </tr> <tr> <tr> <td colspan="2" align="center"> <input type="submit" name="submit" value="Test!"> </td> </tr> </table> </form> </body> </html> <? } else { // if $submit does exist, the form has been submitted // so process it if ($yin === $yang) { $result = "Both variables are identical and of the same type"; } else { $result = "The variables are either not identical or not of the same type"; } ?> <html> <head> <basefont face="Arial"> </head> <body> <b><? echo $result; ?></b> </body> </html> <? } ?>


Alternative syntax
------------------

PHP also supports an alternative syntax for the various control structures discussed so far. For example, you could do this:


<? if ($elvis == 0) { echo "Elvis has left the building!"; } else { echo "Elvis is still backstage!"; } ?> or you could do this <? if ($elvis == 0): echo "Elvis has left the building!"; else: echo "Elvis is still backstage!"; endif; ?>


The second alternative is equivalent to the first, and simply involves replacing the first curly brace of every pair with a colon [:], removing the second curly brace, and ending the block with an "endif" statement.

And that's it for this week. Next time, we'll be bringing you loops, arrays and more forms - so make sure you don't miss it!

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

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