Passing for each values to php script - php

Question

I am passing a table data value within a for each loop to the php script. The problem here is that when I try to echo $exchange;. I don't get any values of the specific product name. The product name being displayed in the form is item1.
<form action="exchangeItem" method="post">
<tbody>
<?php
$query = "SELECT * FROM product";
$data = $MySQLi_CON->query($query);
foreach ($data as $key ) {
?>
<tr>
<td class="id"><h3><input type="hidden" name="productName" ><?php echo $key['product_Name'];?></h3>
</td>
<input name = "id" type = "hidden" value="<?php echo $id; ?>">
<td id="exchange_button">
<input value="Exchange" name="exchange_submit" type="submit" class="btn btn-primary btn-md raised exchange_submit">
</td>
</tr>
<?php
}
?>
</tbody>
</form>
exchangeItem.php
<?php
$exchange = $_POST['productName'];
echo $exchange;
exit;
?>

Answer 1

This
<td class="id"><h3><input type="hidden" name="productName" ><?php echo $key['product_Name'];?></h3>
Should be:
<td class="id"><h3><input type="hidden" name="productName" value="<?php echo $key['product_Name'];?>" ></h3>

Answer 2

first, edit your td
<td class="id"><h3><input type="hidden" name="productName[]" value="<?php echo $key['product_Name'];?>" ></h3>
your name => productName should be in array thats why you need bracket [ ], because you use foreach. then your post will be in array too.
exchangeItem.php
<?php
print_r($_POST['productName']);
exit;
?>

Answer 3

I have added & changed your 2 input name productName[] , id[] and your form action exchangeItem.php if you get product name must be used input name with array like [] because you are used foreach loop.
<form action="exchangeItem.php" method="post">
<tbody>
<?php
$query = "SELECT * FROM product";
$data = $MySQLi_CON->query($query);
foreach ($data as $key ) {
?>
<tr>
<td class="id">
<h3><input type="hidden" value="<?php echo $key['product_Name'];?>" name="productName[]" ><?php echo $key['product_Name'];?></h3>
<input name="id[]" type="hidden" value="<?php echo $id; ?>">
</td>
</tr>
<?php
}
?>
</tbody>
<tfoot>
<tr>
<td id="exchange_button">
<input value="Exchange" name="exchange_submit" type="submit" class="btn btn-primary btn-md raised exchange_submit">
</td>
</tr>
</tfoot>
</form>
exchangeItem.php
<?php
if(isset($_POST['exchange_submit'])) {
$exchange = $_POST['productName'];
foreach($exchange as $product_name) {
echo $product_name;
}
}
?>

Answer 4

The problem you facing here is with this code
<td class="id">
<h3><input type="hidden" name="productName" ><?php echo $key['product_Name'];?></h3>
</td>
here in the input field you didn't have added the value, that's why when you trying to print the posted value in your action file it's showing none. So just add add value to the input field
<td class="id">
<h3><input type="hidden" name="productName" value="<?php echo $key['product_Name'];?>"></h3>
</td>

Answer 5

Set value for you hidden element... No need to place the hidden element in the header tag. Use productName[] for posting array of values.
<td class="id">
<h3><?php echo $key['product_Name'];?></h3>
<input type="hidden" name="productName[]" value="<?php echo $key['product_Name'];?>">
</td>
foreach all posted values to print.
<?php
$exchange = $_POST['productName'];
foreach($exchange as $key) {
echo $key;
}
exit;
?>
Update for select
Change yout html for select values..
<td class="id">
<h3><input type="checkbox" name="productName[]" value="<?php echo $key['product_Name'];?>"><?php echo $key['product_Name'];?></h3>
</td>