Array Merge/Replace

Question

I have two arrays:

Array
(
    [2005] => 0
    [2006] => 0
    [2007] => 0
    [2008] => 0
    [2009] => 0
)

Array
(
    [2007] => 5
    [2008] => 6.05
    [2009] => 7
)

I want to merge these two arrays such that if a value exists in the 2nd array, it overwrites the first array's value. So the resulting array would be:

Array
(
    [2005] => 0
    [2006] => 0
    [2007] => 5
    [2008] => 6.05
    [2009] => 7
)

Thanks for your help.

UPDATE: This was my best attempt, but it's wildly unsuccessful:

    $final = '';
    foreach ($years as $k => $v){
        if (in_array($k,$values)){
            $final .= $values[$k] . '|';
        }else{
            $final .= $k[$v] . '|';
        }

    }

    echo "final = $final";

Answer 1

As I've just recently learned, PHP has an array union operator that does exactly this:

$result = $a + $b;

Where $a is the array with the values that you want to take precedence. (So in your example, that means that the second array is "$a".