Have the following array merged - php

Question

I have the following array:
Array
(
[0] => Array
(
[Vendor_ID] => 1
[Quantity] => 55
)
[1] => Array
(
[Vendor_ID] => 1
[Quantity] => 55
)
[2] => Array
(
[Vendor_ID] => 1
[Quantity] => 55
)
[3] => Array
(
[Vendor_ID] => 3
[Quantity] =>
)
[4] => Array
(
[Vendor_ID] => 3
[Quantity] =>
)
[5] => Array
(
[Vendor_ID] => 3
[Quantity] =>
)
[6] => Array
(
[Vendor_ID] => 4
[Quantity] =>
)
[7] => Array
(
[Vendor_ID] => 4
[Quantity] =>
)
[8] => Array
(
[Vendor_ID] => 4
[Quantity] =>
)
)
Which is being created with the following code:
$Display_Arr = array();
$Tick = 0;
foreach ($_POST['product'] AS $_1){
if (!in_array($_1['vendor_id'], $Display_Arr)){
$Display_Arr[$Tick] = array(
"Vendor_ID" => $_1['vendor_id'],
"Quantity" => ""
);
$Display_Arr[$Tick]["Quantity"] .= $_1['quantity'];
}else{
$Display_Arr[$Tick]["Quantity"] .= $_1['quantity'];
}
++$Tick;
}
echo "<pre>";
print_r($Display_Arr);
echo "</pre>";
But I am not getting my desired output, which is:
Array
(
[0] => Array
(
[Vendor_ID] => 1
[Quantity] => 55,55,55
)
[1] => Array
(
[Vendor_ID] => 3
[Quantity] =>
)
[2] => Array
(
[Vendor_ID] => 4
[Quantity] =>
)
)
Where am I going wrong with this?
#mathielo
The current output is:
Array
(
[1] => Array
(
[Vendor_ID] => 1
[Quantity] => 55
)
[3] => Array
(
[Vendor_ID] => 3
[Quantity] =>
)
[4] => Array
(
[Vendor_ID] => 4
[Quantity] =>
)
)
Whereas, i'm trying to obtain:
[0] => Array
(
[Vendor_ID] => 1
[Quantity] => 55,55,55
)

Answer 1

If I got it right, what you need is this:
EDIT: Just made some tests and got it right this time:
$Display_Arr = array();
foreach ($_POST['product'] AS $_1){
if (!array_key_exists($_1['Vendor_ID'], $Display_Arr)){
$Display_Arr[$_1['Vendor_ID']] = array(
"Vendor_ID" => $_1['Vendor_ID'],
"Quantity" => $_1['Quantity']
);
}else{
if(!empty($_1['Quantity']))
$Display_Arr[$_1['Vendor_ID']]["Quantity"] .= ",{$_1['Quantity']}";
}
}
echo "<pre>";
print_r($Display_Arr);
echo "</pre>";
The main problem was in if (!in_array($_1['vendor_id'], $Display_Arr)). PHP's in_array() checks for given needle in the array values, and we were trying to match to the Vendor_ID value stored in the outer array keys. That was fixed using array_key_exists().
EDIT 2: I used this for test data:
$_POST['product'] = array(
0 => array(
'Vendor_ID' => 1,
'Quantity' => 55
),
1 => array(
'Vendor_ID' => 1,
'Quantity' => 55
),
2 => array(
'Vendor_ID' => 1,
'Quantity' => 55
)
,
3 => array(
'Vendor_ID' => 3,
'Quantity' => ''
),
4 => array(
'Vendor_ID' => 3,
'Quantity' => ''
),
5 => array(
'Vendor_ID' => 3,
'Quantity' => ''
),
6 => array(
'Vendor_ID' => 4,
'Quantity' => ''
),
7 => array(
'Vendor_ID' => 4,
'Quantity' => ''
),
8 => array(
'Vendor_ID' => 4,
'Quantity' => ''
)
);
You won't be needing $Tick anymore, as you could use Vendor_ID as keys for the outer array.

Answer 2

Looks like the easiest way to solve this would be to first aggregate the vendor quantities, and then build the final array with the keys that you are using.
I am assuming the input looks something like this:
$_POST['product'] = [
['vendor_id' => 1, 'quantity' => 55],
['vendor_id' => 1, 'quantity' => 55],
['vendor_id' => 1, 'quantity' => 55],
['vendor_id' => 3, 'quantity' => null],
['vendor_id' => 3, 'quantity' => null],
['vendor_id' => 3, 'quantity' => null],
['vendor_id' => 4, 'quantity' => null],
['vendor_id' => 4, 'quantity' => null],
['vendor_id' => 4, 'quantity' => null],
];
Aggregating the quantities:
$aggregates = [];
foreach ($_POST['product'] as $product) {
$id = $product['vendor_id'];
if ( ! isset($aggregates[$id])) {
$aggregates[$id] = [];
}
if ($product['quantity'] > 0) {
$aggregates[$id][] = $product['quantity'];
}
}
The aggregates array should now look like this:
$aggregates = [
1 => [
0 => 55,
1 => 55,
2 => 55,
],
3 => [], // Empty
4 => [], // Empty
];
As you can see the data is now neatly organized and ready to be put into any format you want. Using the keys that you use in your question it is as simple as:
$output = [];
foreach ($aggregates as $vid => $qty) {
$quantity = implode(',', $qty);
$output[] = ['Vendor_ID' => $vid, 'Quantity' => $quantity];
}
The output should now look like this:
$output = [
['Vendor_ID' => 1, 'Quantity' => '55,55,55'],
['Vendor_ID' => 3, 'Quantity' => ''],
['Vendor_ID' => 4, 'Quantity' => ''],
];

Answer 3

This will output exactly what you are looking for although the output of the last answer (Sverri M. Olsen) is more useful. Here you get the quantities as a string while with Sverri's method you get an array in first place.
$Display_Arr = array();
$vendors=array();
foreach ($_POST['product'] AS $_1){
if (!in_array($_1['vendor_id'],$vendors)){
$vendors[]=$_1['vendor_id'];
$Display_Arr[sizeof($vendors)-1] = array(
"Vendor_ID" => $_1['vendor_id'],
"Quantity" => $_1['quantity']
);
}
else{
$vendorKey=array_search($_1['vendor_id'],$vendors);
$Display_Arr[$vendorKey]["Quantity"] .=(!empty($Display_Arr[$vendorKey]["Quantity"])?',':null).$_1['quantity'];
}
}