filter an array from mysql_query result by value

Question

So... I am PHP dummie and I am trying to filter an array.

I have the following php function to retrieve data from MYSQL

function hook_plan1($vars){
  $result = mysql_query("SELECT * FROM tblpricing WHERE relid=12 AND type='product'");
  $products = array();
    while( $data = mysql_fetch_assoc($result)){
    array_push($products, $data);
    }
  return array(
  "plan1" => $products);
}

That function renders the following array:

->plan1 = Array (7)
  0 => Array (16)
    id => "71"
    type => "product"
    currency => "1"
    ...
  1 => Array (16)
    id => "80"
    type => "product"
    currency => "3"
    ...
  2 => Array (16)
    id => "402"
    type => "product"
    currency => "14"
    ...

I would like to filter that array by "currency" (which comes in the $_SESSION) so I can get a single array, something like this:

->plan1 = Array (16)
    id => "402"
    type => "product"
    currency => "14"
    ...

I was pretty sure it was easy, so I tried the following array filter:

function hook_plan1($vars){
  $currency_id = $_SESSION['currency'];//this is a number
  $result = mysql_query("SELECT * FROM tblpricing WHERE relid=12 AND type='product'");
  while ($data = mysql_fetch_assoc($result)) {
    $products = $data;
  }
  $filter = (is_array($products) && $products['currency'] == $currency_id);
  $filtered_product = (array_filter($products, $filter));
  return array(
    "plan1" => $filtered_product);
}

But it doesn't work :( Any ideas?

Answer 1

As the comments says, it's a lot better if you filter this in the mysql query:

$currency_id = (int)$_SESSION['currency'];//you should be REALLY sure this is a number
$result = mysql_query("SELECT * FROM tblpricing WHERE relid=12 AND type='product' AND currency=$currency_id");

but if for some reason you definitely, absolutely, positively NEED to filter it in the PHP side, then you need to deliver a function that returns a function [insert Inception horn here], in other words your $filter variable should be:

$filter = function($currencyToFilter) {
        return function($arrayRow) use ($currencyToFilter) {
            return $arrayRow['type'] === $currencyToFilter;
        };
    };

That's a Closure thingy . Then you call (notice that i use $products instead of $data ):

$filtered_product = array_filter($products, $filter($_SESSION['currency']));