More efficient way to merge arrays in PHP? -

here's i'm doing:

$daterange = array('2010-01-01', '2010-01-02', '2010-01-03', ...); $data = array('2010-01-01' => 5, '2010-01-03' => 7);  foreach ($daterange $date) {     $values[$date] = $data[$date]; } 

$values results in:

array (     '2010-01-01' => 5     '2010-01-02' => null     '2010-01-03' => 7     ... ) 

seems efficient, wonder if there's simple php function that'll handle this.

$values = array_merge(array_fill_keys($daterange, null), $data); 

whether that's more efficient can found out through testing, i'd it's more concise, easy understand, , it doesn't throw errors non-existent keys in $data. :)