Re: parsing select multiple="multiple"

On Tue, Feb 19, 2013 at 1:02 PM, John Taylor-Johnston <John.Taylor-Johnston@cegepsherbrooke.qc.ca> wrote: > > tamouse mailing lists wrote: >>> >>> >I hate arrays. :D >> >> Here's a small snippet showing how it works, I hope: >> >> foreach ($DPRpriority as $item => $value) { >> echo "<li> ".$item.": ".$value['name']." >> selected: >> ".$value['selected']." </li>\n"; >> } >> > Question 1: when did we have to add [] to a <input> name to turn it into an > array? > > <input type="checkbox" name="DPRlocationdetails[]" > value="Unknown"> > > According to phpinfo() it still comes out as $_POST['DPRlocationdetails'] > without []. > > Are the [] necessary? [] are necessary when you want to return multiple values for a form field, or collection of form fields such as checkbox. AFAIK, this has always been the case with PHP. See https://gist.github.com/tamouse/5002728 > ---------------------------------------------- > Question 2: > I was looking at some code in the Manual, where someone used isset and > is_array. > > How necessary is if(isset($_POST['DPRlocationdetails'])) > > and then to use: if(is_array($_POST['DPRlocationdetails'])) > > That seems like over kill? It's more defensive, in the case where someone may be by-passing your form to send things in. > ---------------------------------------------- > Question 3: > > My code works, perfectly. Then there must be no questions. :) > In this case, I decided to attack some check-boxes > first. The resulting function will work for <select multiple> too.. > > Does anyone see me doing something wrong in my code below? > > My questions are: > > Is this the only way to pass "Unknown", "Family Home" or > "Apartment" into > the function? > > Is this correct? > > ---- if ($_POST['DPRlocationdetails'] == "Unknown") > > Somebody once told me I had to do it this way? > > ---- if ("Unknown" == $_POST['DPRlocationdetails']) In this scenario, these are equivalent. There is no preference of one over the other. I *have* heard claims that something like this is preferrable, though: if (FALSE === $variable) But I think that may have been due to some misunderstanding of precedences in the following sort of scenario: if (FALSE === ($result = some_function()) where if done this way: if ($result = some_function() === FALSE) was giving them bad results. > John > > --------------------snip--------------------------- > > <form action="foo.php" id="DPRform" method="post"><input > value="Update" > type="submit"> > <input type="checkbox" name="DPRlocationdetails[]" > value="Unknown" <?php > filter_value($_POST['DPRlocationdetails'],"Unknown"); ?>> Unknown > <input type="checkbox" name="DPRlocationdetails[]" value="Family > Home" <?php > filter_value($_POST['DPRlocationdetails'],"Family Home"); ?>> Family > Home > <input type="checkbox" name="DPRlocationdetails[]" > value="Apartment" <?php > filter_value($_POST['DPRlocationdetails'],"Apartment"); ?>> Apartment > </form> > > <?php > function filter_value($tofilter,$tofind) { > foreach($tofilter as $value){ > if ($value == $tofind) echo "checked"; > } > } > ?> > >