Well, my code worked fine with that one simple change from "=" to "==" > -----Original Message----- > From: Richard Lynch [mailto:ceo@xxxxxxxxx] > Sent: Wednesday, November 29, 2006 13:47 > To: frank@xxxxxxxxxxx > Cc: php-general@xxxxxxxxxxxxx > Subject: Re: Maybe an HTML prob? > > 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. Which is why my code worked. If $Permission is not "Yes" then $Permission evaluates to "No". I did understand that the HTML wouldn't transmit anything for an unchecked checkbox. That is what I was counting on. I was expecting that $Permission would have been "empty" (or is it not isset?). Frank > > 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
