I have 1 form in with multiple checkboxes in it (each with the code):
<input type="checkbox" name="check_list" value="<? echo $row['Report ID'] ?>"> Where $row['Report ID'] is a primary key in a database -so each value is different.
How would I be able to tell which checkboxes have been checked? (Maybe multiple)
This is for an inbox system and I have a button below that I want (when clicked) to delete all messages (ids of: $row['Report ID']) which have the checkbox's checked.
Set the name in the form to check_list[] and you will be able to access all the checkboxes as an array($_POST['check_list'][]).
Here's a little sample as requested:
<form action="test.php" method="post"> <input type="checkbox" name="check_list[]" value="value 1"> <input type="checkbox" name="check_list[]" value="value 2"> <input type="checkbox" name="check_list[]" value="value 3"> <input type="checkbox" name="check_list[]" value="value 4"> <input type="checkbox" name="check_list[]" value="value 5"> <input type="submit" /> </form> <?php if(!empty($_POST['check_list'])) { foreach($_POST['check_list'] as $check) { echo $check; //echoes the value set in the HTML form for each checked checkbox. //so, if I were to check 1, 3, and 5 it would echo value 1, value 3, value 5. //in your case, it would echo whatever $row['Report ID'] is equivalent to. } } ?> 
$check will equal on.
if($_POST) - useless, $_POST will always be true. You should check if !empty($_POST['check_list']) instead.
array_key_exists('check_list', $_POST) && !empty($_POST['check_list'])empty() doesn't cause this error. From the manual: empty() does not generate a warning if the variable does not exist. Edit To reflect what @Marc said in the comment below.
You can do a loop through all the posted values.
HTML:
<input type="checkbox" name="check_list[]" value="<?=$rowid?>" /> <input type="checkbox" name="check_list[]" value="<?=$rowid?>" /> <input type="checkbox" name="check_list[]" value="<?=$rowid?>" /> PHP:
foreach($_POST['check_list'] as $item){ // query to delete where item = $item } 
[] syntax in the field definition, which makes PHP create that $_POST value as an array. Otherwise it'll be a single non-array value, causing the foreach() loop to blow up.you have to name your checkboxes accordingly:
<input type="checkbox" name="check_list[]" value="…" /> you can then access all checked checkboxes with
// loop over checked checkboxes foreach($_POST['check_list'] as $checkbox) { // do something } ps. make sure to properly escape your output (htmlspecialchars())
<input type="checkbox" name="check_list[<? echo $row['Report ID'] ?>]" value="<? echo $row['Report ID'] ?>"> And after the post, you can loop through them:
if(!empty($_POST['check_list'])){ foreach($_POST['check_list'] as $report_id){ echo "$report_id was checked! "; } } Or get a certain value posted from previous page:
if(isset($_POST['check_list'][$report_id])){ echo $report_id . " was checked!<br/>"; } It's pretty simple. Pay attention and you'll get it right away! :)
You will create a html array, which will be then sent to php array. Your html code will look like this:
<input type="checkbox" name="check_list[1]" alt="Checkbox" value="checked"> <input type="checkbox" name="check_list[2]" alt="Checkbox" value="checked"> <input type="checkbox" name="check_list[3]" alt="Checkbox" value="checked"> Where [1] [2] [3] are the IDs of your messages, meaning that you will echo your $row['Report ID'] in their place.
Then, when you submit the form, your PHP array will look like this:
print_r($check_list)
[1] => checked [3] => checked
Depending on which were checked and which were not.
I'm sure you can continue from this point forward.
check_list[] would start with check_list[0] rather than check_list[1].