将项添加到数组

So my knowledge of php arrays is limited. I have read the PHP Arrays - Manual But it did not explain this in enough value for me to grasp it honestly.

I have the following in a if{} else{} statement with this being the else{}

// Set up an array for the items

while($row = mysqli_fetch_array($result))
{
   $source = $row['source'];
}

$items = array( 
   "id" => $id,
   "source" => $source,
);

$_SESSION['items'] = $items;

Let's say I have the following items:

Item A with an ID of 1 and source of foo
Item B with an ID of 2 and source of boo
Item C with an ID of 3 and source of goo

if this function gets called with item A, the array is created with an id of 1 and source of foo and that is all that is placed in the array. And the array is dumped out like:

array(2) { ["id"]=> string(2) "25" ["source"]=> string(64) "https://www.alphahq.org/shop/views/assets/images/items/item2.jpg" }

Now what if the function gets called again for item B right now as it sets, the array will changed to the variables for item B Correct?

How would I be able to add item A and item B to the same array and define them as separate items.

So basically how could I do this:

array {
  item A {
    id => 1
    source => foo
  }
  item B {
    id => 2
    source => boo
  }
}

And just build the array as an item is added. I am saving the array in a session, could this be helpful in retrieving and adding to the array each time the function is called?

Just for additional help my full shopping-functions.php file is included below for reference.

<?php

session_start();

require('../../config/database-connect.php');

// Start a new order for a customer 
$action = $_GET['action'];
$id     = $_GET['id'];

// First make sure the action is not blank 
if ($action == '') {

    echo 'Please select an action';
}

if ($action == 'add') {

    // Check if the id matches one in the database 
    $result = mysqli_query($con,"SELECT id, source FROM items WHERE id='$id'");

        if (mysqli_num_rows($result) == 0) {

            echo 'That id is not valid!';
        }
        else {

            // Set up an array for the items

            while($row = mysqli_fetch_array($result))
            {
                $source = $row['source'];
            }

            $items = array(
                "id" => $id,
                "source" => $source,
            );

            var_dump($items);

            $_SESSION['items'] = $items;
        }
}

?>

first do this

$items = array(); // it's a good practice to initialize first
while($row = mysqli_fetch_array($result))
{
    $items[] = array( // these [] means it will append to last part of array
       "id" => $id,
       "source" => $row['source'], // key with source
    );
}
 // here if you var_dump($items) you will see the result

while($row = mysqli_fetch_array($result))
                        {
                                $source = $row['source'];
                                 $items = array(
                                    "id" => $id,
                                    "source" => $source,
                                );
                            $_SESSION['items'][] = $items;
                        }

Multi - dimensional array

You probably want to store another array in $_SESSION['items']; which makes it multi dimensional array.

what [] will do is that it stack the next fed values to the next available key

Means first value of $item will be stored in $_SESSION['items'][0] 2nd value of $item will be stored in $_SESSION['items'][1] and so on ..

For this case

// Based on pr1nc3's answer
$_SESSION['items'] = array(); // create a new array

foreach($myResult as $row)
    $_SESSION['items'][] = $row;

The [] is the magic here: it says to PHP "Take the array identified before [] and push this item onto it" - in fact, this is essentially a shorthand for the array_push method:

$a = $b = array();
$c = array(1,2,3,4,5,6);

foreach($c as $value) {
    $a[] = $value;
    array_push($b, $value);
}

After the above, $a and $b will look the same in a var_dump call.

From the doc:

array_push — Push one or more elements onto the end of array
...Has the same effect as:

$array[] = $var;

Let's apply that to your case :

$items = array(); // has to be initialised first, somewhere in your code 
// ....
// Then after your while loop
$new_item = array("id" => $id, "source" => $source);

array_push($items, $new_item); // append $new_item inside $items as its last value.

Hope it helps !