I am storing an array in a session, but I am not able to manipulate it. How do I add all the array values?
I tried this way:
$item = $_SESSION['item'];
$total = 0;
foreach($item as $x) {
$total += $x;
}
echo $total;
exit();
however, the return is:
Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\quiz_Acaro\final.php on line 70
0
This error means that you are trying to iterate through an element that is not an array.
First you need to know / ensure that the value of the item is an array
$item = $_SESSION['item'];
$total = 0;
if(is_array($item)){
foreach($item as $x) {
$total += $x;
}
echo $total;
}else{
echo 'Ops! Esse item nao é um array';
}
exit();
The error Invalid argument supplied for foreach() happens when you pass foreach a non-iterable value.
So you should have a check if the value $_SESSION['item'] can actually be iterated:
if (isset($_SESSION['item']) && is_array($_SESSION['item']) {
// Resto do seu código aqui
}
I have chosen to use isset , because if you use is_array directly, a E_NOTICE will be emitted if the 'item' of array does not exist.