Merge "Defaults" array with "Input" array? PHP Which Function? -

lets having user provide information.

array 1 

but not required. have defaults.

array 2 

does php have function overwrite array values of array 2 based on if supplied in array 1, , not empty?

i'm not sure either of these answers helping out (they didn't me) case when "defualts" may associative array more 1 level deep.

i think looking array_replace_recursive.
$finalarray = array_replace_recursive(array $defaults, array $inputoptions)

heres example takes optional array of options function , processing based on result of options "opts" , defaults specify:

function do_something() {     $args = func_get_args();             $opts = $args[0] ? $args[0] : array();      $defaults = array(         "second_level" => array(                     "key1" => "val1",                     "key2" => "val2"                 ),         "key1" => "val1",         "key2" =>  "val2",         "key3" => "val3"     );      $params = array_replace_recursive($defaults, $opts);     // these merged parameters } 

check out here