Question

I need to combine the keys from an array, with the values in another array:

$a = array(4=>2000,5=>5000,7=>1000,3=>5000);
$b = arrray(array(0=>0,1=>4,2=>10,3=>1000),array()...)

This is what I’ve written (not working):

$keys = array_keys($a);
foreach ($b as $k => $v) {
array_combine($keys,$v);
}

What I expect to get is:

$c = array(array(4=>0,5=>4,7=>10,3=>1000),array(4=>...));

Answer 1

Since b has multiple arrays in it, you will just need to do a simple iteration of b:

$a = array(4=>2000,5=>5000,7=>1000,3=>5000);
$b = array(array(0=>0,1=>4,2=>10,3=>1000), array(0=>0,1=>4,2=>10,3=>1000));

$keys = array_keys($a);
$length = count($keys);
$c = array();
foreach($b as $sub) {
    if(!is_array($sub)) {
        $sub = array();
    }

    $c[] = array_combine(array_pad($keys, count($sub), NULL), array_pad(array_values($sub), $length, NULL)); // Pad removes the possibility of a warning
}

print_r($c);

You had the right idea with array_keys($a) and array_combine(). The other argument you needed to feet into array_combine() is the values, array_values($b). But since there are multiple arrays in b, you need to loop through each. As a failsafe in case there are more or less key/value pairs in a or any of the sub-arrays of b, I have added array_pad() to make sure that the two arrays passed in to array_combine() are of equal length so that PHP doesn’t complain.