Basic array build - php

Question

Guess this is a basic question.
How can I make an array similar to this, using a foreach loop?
[
[
'ProductGuid' => '27760c24',
'BaseAmountValue' => 240,
'Quantity' => 1,
'Discount' => 0,
'AccountNumber' => 1000,
'Unit' => 'parts',
],
[
'ProductGuid' => '27760c24',
'BaseAmountValue' => 250,
'Quantity' => 1,
'Discount' => 0,
'AccountNumber' => 1000,
'Unit' => 'parts',
]
],
The following is rejected by the API, i'm trying to connect to:
$arr = array();
foreach($items as $item) {
$arr[]['ProductGuid'] = $item->guid;
$arr[]['BaseAmountValue'] = $item->price;
$arr[]['Quantity'] = $item->qty;
$arr[]['Discount'] = $item->discount;
$arr[]['AccountNumber'] = 1000;
$arr[]['Unit'] = 'parts';
}
Hope one of you will be able to help me :)

Answer 1

An alternative to the other two correct answers but without manually setting the array index or use any temporary variables:
$arr = [];
foreach($items as $item) {
$arr[] = [
'ProductGuid' => $item->guid,
'BaseAmountValue' => $item->price,
'Quantity' => $item->qty,
'Discount' => $item->discount,
'AccountNumber' => 1000,
'Unit' => 'parts',
];
}
Martin explained the actual issue so well so no need to go through it again.

Answer 2

Using the given code, you create new inner rows in your array in each line of that loop. The following code will solve that:
$arr = array();
foreach($items as $item) {
$mappedItem = [];
$mappedItem['ProductGuid'] = $item->guid;
$mappedItem['BaseAmountValue'] = $item->price;
$mappedItem['Quantity'] = $item->qty;
$mappedItem['Discount'] = $item->discount;
$mappedItem['AccountNumber'] = 1000;
$mappedItem['Unit'] = 'parts';
$arr[] = $mappedItem;
}

Answer 3

You're fairly close to one way of doing this...
Explanation:
$arr[]['ProductGuid'] = $item->guid;
^^
\= Next numeric array key.
What this is doing is setting the productGuid key on the next numeric outer array, so in effect what you're actually setting is:
$arr[0]['ProductGuid'] = $item->guid;
$arr[1]['BaseAmountValue'] = $item->price;
$arr[2]['Quantity'] = $item->qty;
$arr[3]['Discount'] = $item->discount;
$arr[4]['AccountNumber'] = 1000;
$arr[5]['Unit'] = 'parts';
Which is clearly not what you want.
One Solution:
Therefore you will have to set the array key value on each iteration of the foreach loop.
One way of doing this is manually setting an iterator integer key value:
$arr = [];
$x = 0;
foreach($items as $item) {
$arr[$x]['ProductGuid'] = $item->guid;
$arr[$x]['BaseAmountValue'] = $item->price;
$arr[$x]['Quantity'] = $item->qty;
$arr[$x]['Discount'] = $item->discount;
$arr[$x]['AccountNumber'] = 1000;
$arr[$x]['Unit'] = 'parts';
$x++; // +1 to value of $x
}
Edit:
Nico's way of doing this is a bit neater and a bit smarter.