PHP array_merge空值总是少于优先级

你可以使用array_replace和array_filter

$mergedArray = array_replace($b, array_filter($a));

结果将是:

array(3) {
  ["key1"]=>
  string(19) "key1 from prioritar"
  ["key2"]=>
  string(24) "key2 from LESS prioritar"
  ["my_problem"]=>
  string(18) "I REACHED MY GOAL!"
}