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Checking The Boxes - PHP

After teaching you the fundamentals of form processing, PHP 101 returns with an explanation of WHILE, FOR and FOREACH loops, those PHP constructs that can save you hours of unnecessary HTML coding. Also included: array variables, the auto-increment operator, and some yummy desserts.

TABLE OF CONTENTS:
  1. PHP 101 (part 3) - Chocolate Fudge And Time Machines
  2. Back To The Future
  3. Revisiting The Past
  4. Doing It By The Numbers
  5. Anyone For Apple Pie?
  6. The Generation Gap
  7. What's That Noise?
  8. Checking The Boxes
  9. Miscellaneous Notes
By: Vikram Vaswani and Harish Kamath, (c) Melonfire
Rating: starstarstarstarstar / 6
August 15, 2000

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In addition to their obvious uses, arrays and loops also come in handy when processing forms in PHP. For example,

Here's a simple example which demonstrates how arrays can be used when processing checkboxes in an HTML form:

<html> <head> </head> <body> <? // check for $submit if (!$submit) { // and display form ?> <form action="jukebox.php4" method="GET"> <input type="checkbox" name="artist[]" value="Bon Jovi">Bon Jovi <input type="checkbox" name="artist[]" value="N'Sync">N'Sync <input type="checkbox" name="artist[]" value="Boyzone">Boyzone <input type="checkbox" name="artist[]" value="Britney Spears">Britney Spears <input type="checkbox" name="artist[]" value="Jethro Tull">Jethro Tull <input type="checkbox" name="artist[]" value="Crosby, Stills & Nash">Crosby, Stills & Nash <br> <input type="submit" name="submit" value="Select"> </form> <? } // or display the selected artists else { ?> <b>And here are your selections:</b> <br> <? // use a "for" loop to read and display array elements for($count = 0; $count < sizeof($artist); $count++) { echo "<i>$artist[$count]</i><br>"; } } ?> </body> </html>
In this case, when the form is submitted, PHP will automatically create an array variable named $artist, and populate it with the items selected. This is useful when you need to group related form data together.

The same technique can be applied to "multiple select" list boxes:


<html> <head> </head> <body> <? // check for $submit if (!$submit) { // and display form ?> <form action="jukebox.php4" method="POST"> <select name="artist[]" size="6" multiple> <option value="Bon Jovi">Bon Jovi</option> <option value="N'Sync">N'Sync</option> <option value="Boyzone">Boyzone</option> <option value="Britney Spears">Britney Spears</option> <option value="Jethro Tull">Jethro Tull</option> <option value="Crosby, Stills & Nash">Crosby, Stills & Nash</option> </select> <br> <input type="submit" name="submit" value="Select"> </form> <? } // or display the selected artists else { ?> <b>And here are your selections:</b> <br> <? // use a "for" loop to read and display array elements for($count = 0; $count < sizeof($artist); $count++) { echo "<i>$artist[$count]</i><br>"; } } ?> </body> </html>


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

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