Session multi-dimensional array error

Question

I am having a problem with a session multi-dimensional array I am trying to add values to. I am told that I should state the array "before" I start adding values, but when I do that the array is treated like a normal array without being a session. Thus, that will not work for my case. At the same time, the code error is ruining my code. I have no idea how I can solve this problem.

Here are the code lines which are causing the error message

Warning: Cannot use a scalar value as an array

(Of course I have more code than this, these are just the lines that affect the issue):

PHP:

for($i=0; $i < count($_POST['part_number']); $i++) {
$_SESSION['qty'][$i] = $_POST['qty'][$i];
}

HTML:

<input type="text" value="1" name="qty[0]" size="2" />

What is $_SESSION['qty']? Try: var_dump($_SESSION['qty']);. — gen_Eric
– gen_Eric, Commented Nov 19, 2013 at 17:53
@RUJordan, Like I said, then the array is treated as a regular array instead of a Session, correct? — Tigerman55
– Tigerman55, Commented Nov 19, 2013 at 17:53
Check for existence of $_SESSION['qty'] and if exists check it's type with is_array() ... if it's an array you should be able to alter it, if not it must not be set, so create a new array. — Darren Crabb
– Darren Crabb, Commented Nov 19, 2013 at 17:54
Are you calling session_start? If you don't start it manually and it's not started automatically, then $_SESSION won't be magic. — Benubird
– Benubird, Commented Nov 19, 2013 at 17:55

Benubird · Accepted Answer · 2013-11-20 11:30:56Z

1

Most likely, either $_SESSION['qty'] or $_POST['qty'] is not an array. Try this:

if(!isset($_SESSION['qty']) || !is_array($_SESSION['qty'])) $_SESSION['qty'] = array();
if(!is_array($_POST['qty'])) throw new Exception('Error: $_POST[\'qty\'] is not an array!');
for($i=0; $i < count($_POST['part_number']); $i++) {
    if(!isset($_POST['qty'][$i])) continue;
    $_SESSION['qty'][$i] = $_POST['qty'][$i];
}

edited Nov 20, 2013 at 11:30

answered Nov 19, 2013 at 17:53

Benubird

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3 Comments

Sterling Archer Over a year ago

Check your quotes in the exception

Tigerman55 Over a year ago

Yes, I had to escape the single quotes. However, other than that this worked excellent! Thank you.

Benubird Over a year ago

@RUJordan Oops, you're right, I forgot to escape the quotes. Fixed now.

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