Merge Arrays when one value is >0 then return new array

Question

I'm trying to merge two arrays into one (PHP), except in the new array I only want to display values from the combination of both arrays where $b > 0.

I've used array_filter to get the values where $b > 0, but now I need help combining the arrays together and returning a final array which I will then insert into a database.

For example if $a = [0] => 351 [1] => 352 [2] => 353

and $b = [2] => 3 //array_filter has removed [0] => 0 [1] => 0

I would want the new array ($c) to be [0] => 353,3 using the following code:

print_r($a = $_POST['price']); 
print_r($b = array_filter($_POST['qty']));

$count = count($a);
$i = 0;

while ($i < $count)
{
    $c = $a[$i] . "," . $b[$i]; 
    $i++;
}

foreach ($_POST as $key => $value)
{
    print_r ($c);
}

However at present my result is this:

Array //$a
(
    [0] => 351
    [1] => 352
    [2] => 353
)
Array //$b
(
    [2] => 1
)
353,1353,1353,1 //$c

Answer 1

You mean something like this?

$a = array(351, 352, 353);
$b = array(2 => 3);

$c = array();
foreach($b as $key => $value)
{
    $c[] = $a[$key];
    $c[] = $b[$key]; 
}

print_r($c);

This will give you:

Array ( [0] => 353 [1] => 3 ) 

And if you want to have the array $c as comma seperated string use:

$c = implode(',', $c);

This will give you:

'353,3'