怎么合并2个JSON数组

$json1 = <<

$arr1 = array();
$arr2 = array();
$arr3 = array();

$web=json_decode($json1);
$arr1=json_to_array($web);
$web=json_decode($json2);
$arr2=json_to_array($web);

$arr3 = array_merge($arr1,$arr2);
echo "
";
print_r($arr3);

function json_to_array($web){
$arr=array();
foreach($web as $k=>$w){
if(is_object($w)) $arr[$k]=json_to_array($w); 
else $arr[$k]=$w;
}
return $arr;
}