动态添加到php const数组？

Question

I know that since php 5.6 you can set a constant as an array, but is it possible to build one dynamically?

This works:

const FIELDS = array("email","firstName");

But I'd like to run a query that populates the constant instead:

while($row = mysqli_fetch_assoc($results)) {
   const FIELDS[] = $row['field'];
}

But that doesn't work. I also tried:

while($row = mysqli_fetch_assoc($results)) {
  $array[] = $row['field'];
}
const FIELDS = $array;

But this also doesn't work. Is there a way to accomplish this? Or does the array have to be hardcoded to be set as a constant?

Answer 1

I fully acknowledge this is an improper use of a constant, and I've since changed it to simply use a variable, HOWEVER -- this is how I did find you could accomplish it:

while($row = mysqli_fetch_assoc($results)) {
  $array[] = $row['field'];
}
DEFINE('FIELDS', serialize($array));
print_r(unserialize(FIELDS));

Without first serializing the array, I wasn't able to get the DEFINE approach to work (maybe it's different in 7.0?) This requires you to unserialize it before output.