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

this has already been answered here: http://stackoverflow.com/questions/25147/how-can-i-merge-php-arrays

Answer 2

I'm not that familiar with PHP, but something like:

foreach ($array2 as $i => $value) {
  $array1[$i] = $value;
}

Answer 3

Well, array merge wont work because it has numeric keys, we should build a new function for this..

function combine($a1, $a2)
    foreach ($a2 as $k => $v) {
        $a1[$k] = $v;
    }
    return $a1;
}

There you go.

Answer 4

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".

Answer 5

Can't it just be this simple:

$new_array = array_unique(array_merge($ar1,$ar2));

Maybe I'm missing something or I'm crazy.