On Wed, November 29, 2006 12:52 pm, Frank Reichenbacher, Bio-Concepts,
Inc. wrote:
> $Permission = $_POST["Permission"];
> if ($Permission = "Yes") {
In addition to the aforementioned = versus == error, your code will
generate an E_NOTICE for an unchecked "Permission" box.
HTML/HTTP simply does not transmit anything at all for unchecked boxes.
A better expression might be:
$Permission = isset($_POST['Permission']) ? "yes" : "no";
The actual value sent by a single checkbox is rarely of any use.
But when you have a whole array of them, it can be very useful indeed.
E.g.;
<input type="checkbox" name="Permission[newsletter]" value="7" />
<input type="checkbox" name="Permission[coupons]" value="5" />
.
.
.
<?php
//list of all possible permissions:
$Permissions = array('newsletter', 'coupons', 'share_email');
$Permission = isset($_POST['Permission']) ? $_POST['Permission'] :
array();
$granted = array();
foreach($Permissions as $p){
if (isset($Permission[$p])) $granted[$p] = $Permission[$p];
}
var_dump($granted);
?>
In this not-so-great example, not only do we have the index of the
array for the Permission, but also the value -- which doesn't have
much meaning in this context.
But with an N-to-N relationship in SQL, the multiple checkbox as an
array can often provide a very nice pattern for relating:
table1 <-> cross-table <-> table2
where the checkboxes indicate which rows exist in 'cross-table' for
any given ID in table1, to relate them N-to-N to all the IDs in the
checkbox values for table2.
This is an idiom where PHP performs like a thoroughbred, while most
other web application languages look like total nags.
YMMV
--
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some starving artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
