What property inside the form can I use to assign this index string [‘size’]

I have this database field that used as the form input value '. $variety['price']. ' I also have a '. $variety['size']. ' database field that carry the name of the product but I don't know what another form input property to use to assign this size database field as a value to the input form property?

I feel like I have run out of properties to carry more values to other values beside price to cart.php.

Thank you the script is as below.

<form action="cart.php" method="post">
foreach($product['varieties'] as $variety){ 
echo'<input style="width:10px; margin-left:9px; " name="price[]" type="checkbox" value="' . $variety['price']. '"  />';
}
</form>

PHP:

 

If you are trying to encapsulate it from the user try using a hidden input field. If you want the user to see it, put it in a visible text input field.

Using the text input approach:

<form action="cart.php" method="post">
<?php

foreach($product['varieties'] AS $variety)
{
	echo'<input style="width:10px; margin-left:9px; " name="price[]" type="checkbox" value="' . $variety['price']. '"  /> <br />';
	echo'<input style="width:10px; margin-left:9px; " name="size[]" type="text" value="' . $variety['size']. '"  />';
}

?>
</form>

Code (markup):

or using the hidden input field approach:

<form action="cart.php" method="post">
<?php

foreach($product['varieties'] AS $variety)
{
	echo'<input style="width:10px; margin-left:9px; " name="price[]" type="checkbox" value="' . $variety['price']. '"  /> <br />';
	echo'<input style="width:10px; margin-left:9px; " name="size[]" type="hidden" value="' . $variety['size']. '"  />';
}

?>
</form>

Code (markup):