Question

I am currently trying to design a for loop to iterate through any ‘checked’ check boxes, and from that, use the value within the ‘value’ slot to run some queries. I am unfortunately struggling with this as the list of checkboxes are not pre-defined, they are dynamic from the database pending the users previous selection.

The loop actually works to present the items to be checked:

?>
    <input type="checkbox" name="option[]" value="$listing_id">
    <font size="+1" color="green"><?php echo"$list_name"; ?>:</font><br />
<?php

The listing ID within the value is what I need to work with in a mysql query before I run an update query. The for loop that’s meant to work is:

foreach($_POST['option'] as $option) //loop through the checkboxes
{
    ...
}

The update query will work within this as its simply copied from somewhere else, I just need the ‘Listing_ID’ from the check boxes that are checked.

I ran this code to hopefully do some debugging:

if(empty($_POST['option'])){
    echo "no checkboxes checked.";
} else {
    if(!isset($_POST['option'])){
        echo "no set.";
    }
}

and it returns “no checkboxes checked.”

I have now hit a grey area as to why this for loop isn’t working (this was taken from another example on the internet).

Answer 1

Try echoing out the $option in the loop to see what the value is and there you can see if there is something there.

foreach($_POST['option'] as $option) //loop through the checkboxes
{
    echo $option . "<br />";
}

Also make sure your form’s method is set to POST or that it’s action is pointed to the correct place. You also have an error in your input:

<input type="checkbox" name="option[]" value="$listing_id">

I assume you meant:

<input type="checkbox" name="option[]" value="<?php echo $listing_id;?>">

UPDATE:

The error ended up not being in the code posted. Error was discovered in an if statement that always returned false that in-cased the code posted above.