passing array and user input using form

Question

I am having difficulties dealing with form that passes an array. I have included 5 variables ("$a,$b,$c,$d,$e") in an array called $product, then I passed it to another frame use form along with an input that requires user typing in a value. So there would be a array and an input being passed at the same time. So should I use "post" or "get"? It seems I should use "post" to pass the array, but the user input could only be passed via "get" right? Following is the code I had (the form is inside a table):

print "<td><form class=button action='bottom_right.php' method='post' target='bottom_right'>
        <input type='text' name='quantity'>
        <input type='hidden' name='product' value='<?php echo($product) ?>'>
        <button type='submit' class='btn btn-primary mb-2'>Add</button>
      </form></td>";

Besides, how could I retrieve the contents from another frame? Should that be something like below? How could I echo a single variable from the array?

<?php  
session_start();
$quantity=$_POST['quantity'];
$product=$_POST['product'];
echo $quantity;
echo $product['a'];
echo $b;
?>

Looking forwards to your reply! Cheers!

You can't have an open PHP tag and echo inside a string you're printing. And echoing an array won't really work either. — Don't Panic
– Don't Panic, Commented May 14, 2018 at 16:44
Little confused. What does this look like when viewing rendered source? value='<?php echo($product) ?>. — ficuscr
– ficuscr, Commented May 14, 2018 at 16:45
@ficuscr I would assume it looks like value='<?php echo(Array()) ?> (with an array to string conversion notice.) — Don't Panic
– Don't Panic, Commented May 14, 2018 at 16:46
Can you show how you create the $product array, some example values, and an example of what you're trying to get out of it when the form is submitted? — Don't Panic
– Don't Panic, Commented May 14, 2018 at 16:48
Hi! Can you edit your question to show the output of var_dump($product), please? — Don't Panic
– Don't Panic, Commented May 14, 2018 at 16:54

ficuscr · Accepted Answer · 2018-05-14 16:59:41Z

1

Might be as simple as using explode/implode to transport the array.

<input type='hidden' name='product' value='<?= implode(',', $product) ?>' />

And then in PHP, you'll be looking for a string of concentated values under the product key.

<?php  

$quantity = (isset($_POST['quantity'])) $_POST['quantity'] ? : null;
$product = (isset($_POST['product'])) $_POST['product'] ? : '';
$productArray = explode(',', $product);

var_dump($productArray);

You could use POST or GET. You can convert the array to a string, using a delimiter to tokenize the parts, or you could use multiple hidden fields, one for each value in the array.

<!-- would probably POST if going this route...? -->
<input type='hidden' name='product[a]' value='<?= $product['a'] ?>' />
<input type='hidden' name='product[b]' value='<?= $product['b'] ?>' />

Play around with it and use var_dump($_POST); to understand how the approaches modify what you receive.

edited May 14, 2018 at 16:59

answered May 14, 2018 at 16:49

ficuscr

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6 Comments

Don't Panic Over a year ago

I agree! Although there is still the problem of the whole HTML section that contains $product being a string output with print

ficuscr Over a year ago

The "frame" stuff is throwing me off.

Don't Panic Over a year ago

Yeah, same here, I'm not sure what that's referring to in this context.

张剑桥 Over a year ago

Actually I need to divide the whole page into three sections: left section, top_right section and bottom_section, each being used to displayed different contents

ficuscr Over a year ago

@张剑桥 Don't focus on the frame stuff so much. Complicates it unnecessarily I think. With iFrames you can just as well think of it as 3 separate pages.

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