finding matching and corresponding values in 2 arrays - php

Question

I have 2 arrays:
first array of total transactions (haystack):
[0] => Array (
[transaction_id] => 62369600431
[invoice_number] => 37161
)
[1] => Array (
[transaction_id] => 62369595048
[invoice_number] => 37346
)
[2] => Array (
[transaction_id] => 62369537530
[invoice_number] => 38064
)
Second array of select orders (needle):
[0] => Array (
[invoice_number] => 37161
)
[1] => Array (
[invoice_number] => 37346
)
My goal is to create a third array that finds all transaction_id from the first array that have a match of order_id from the second.
I have tried array_merge and array_intersect both unsuccessfully (because I don't fully understand how to use them obviously.)

Answer 1

You might use array_filter and get all the invoice_numbers to check for using example array_column.
Then in the filter, check if the number occurs in the invoice_numbers using in_array.
$array1 = [
[
"transaction_id" => 62369600431,
"invoice_number" => 37161
],
[
"transaction_id" => 62369595048,
"invoice_number" => 37346
],
[
"transaction_id" => 62369600431,
"invoice_number" => 38064
]
];
$array2 = [
[
"invoice_number" => 37161
],
[
"invoice_number" => 37346
]
];
$invoiceNumbers = array_column($array2, "invoice_number");
$result = array_filter($array1, function($x) use ($invoiceNumbers) {
return in_array($x["invoice_number"], $invoiceNumbers);
});
print_r($result);
Output
Array
(
[0] => Array
(
[transaction_id] => 62369600431
[invoice_number] => 37161
)
[1] => Array
(
[transaction_id] => 62369595048
[invoice_number] => 37346
)
)
Php demo