Echo out one value from an array - php

Question

I selected an array of product IDs and product names from the table product. I tried to echo out only one product name from the array, but all I got was the first letter of the product name. Below is my code. Thanks in advance for any tips.
$info1 = $conn->prepare("SELECT `productid`,`productname` FROM `$product` WHERE id = :id ORDER BY `productname` ASC ");
$info1 ->bindParam(':id', $sessionid , PDO::PARAM_INT);
$info1->execute();
while ($userinfo1 = $info1->fetchobject()) {
$productid = "$userinfo1->productid";
$productname = "$userinfo1->productname";
}
echo $productname[0];

Answer 1

Add brackets to the variables inside the while loop to create the array
while ($userinfo1 = $info1->fetchobject()) {
$productid[] = "$userinfo1->productid";
$productname[] = "$userinfo1->productname";
}
echo $productname[0];//this will print the first productname
I think is better make just 1 array of objects
$array=array();
while ($userinfo1 = $info1->fetchobject()) {
$array[] = $userinfo1;
}
echo $array[0]->productname;

Answer 2

instead of doing this :
$info1 = $conn->prepare("SELECT `productid`,`productname` FROM `$product` WHERE id = :id ORDER BY `productname` ASC ");
$info1 ->bindParam(':id', $sessionid , PDO::PARAM_INT);
$info1->execute();
while ($userinfo1 = $info1->fetchobject()) {
$productid = "$userinfo1->productid";
$productname = "$userinfo1->productname";
}
echo $productname[0];
Do this :
$info1 = $conn->prepare("SELECT `productid`,`productname` FROM `$product` WHERE id = :id ORDER BY `productname` ASC ");
$info1 ->bindParam(':id', $sessionid , PDO::PARAM_INT);
$info1->execute();
$counter =0;
while ($userinfo1 = $info1->fetchobject()) {
$productid[] = "$userinfo1->productid";
$productname[] = "$userinfo1->productname";
echo $productid[counter];
echo $productname[counter];
counter++;
}
this way you'll echo out every value of the array

Answer 3

You have various options at your disposal. Take your look for instance, you could create an associative array like the following:
$items = array();
while ($userinfo1 = $info1->fetchobject()) {
$item = array(
'productid' => $userinfo1->$productid,
'productname' => $userinfo1->$productname
);
array_push($items, $item);
// or you could use native
// $uitems[] = $item;
}
That would give you an array ($users) that you could loop through and fetch for set index:
foreach($items as $item) {
print_r($item); // prints the whole user item.
//print $item['productid']; /* or even print the users product id.*/
}
Or simple for one item like you requested:
echo $items[0]['productid'];
Alternatively: if you'd like seperate arrays, you could do as stated in the other answers:
while ($userinfo1 = $info1->fetchobject()) {
$productid[] = "$userinfo1->productid";
$productname[] = "$userinfo1->productname";
}