How to assign value to an array in while loop in php from mysqli result to make a counter to filter another while loop?

Question

How to assign value to an array in while loop in php from mysqli result to make a counter to filter another while loop??

I want to assign something like this for my counter variable:

$counter = array("6:00 Am" => 0, "8:00 Am" => 0, "10:00 Am" => 0);

For this code:

//This is from transaction table
$stm2 = "SELECT tr_sched FROM transaction WHERE tr_date = CURRENT_DATE()";
$res2 = $conn->query($res2);
while($rows5 = $res2->fetch_assoc())
{
  //Not working
  $counter[] = array($rows5['tr_sched'] => 0)
}

So I can filter this another while loop if the schedule time is greater than to my limit variable, like this:

//This is from my schedule table
$stm = "SELECT sc_time FROM schedule GROUP BY sc_time";
$res = $conn->query($stm);
$counter = array();
while($row4 = $res4->fetch_assoc())
{
  //Note working
  if($counter[$row4['sc_time']] >= $limit/*=10*/)
  {
  echo "<option disabled="">" . $row4['sc_time'] . "</option>";
  }
  else
  {
  echo "<option>" . $row4['sc_time'] . "</option>";
  }
}

The goal of all the codes above is to display all schedule time from schedule table as an option for select element and if the schedule time is already have a 10 records or greater than(limit variable) on my transaction table for today it will display as option but disable so it can't be selected by user. I hope you get what I mean, I will try to keep active to answer if you have something to clarify about my question.

Answer 1

You don't need the while loop at all.

You can use array functions to populate the array with static values.

$stm2 = "SELECT tr_sched FROM transaction WHERE tr_date = CURRENT_DATE()";
$res2 = $conn->query($stm2);
// get values from a single column
$keys = array_column($res2->fetch_all(MYSQLI_ASSOC), 'tr_sched');
// create an array with all values as 0 and keys from $keys
$counter = array_fill_keys($keys, 0);

Of course, don't reset the array later on with $counter = array();

If you want to loop anyway, then you can use a simple foreach loop.

$stm2 = "SELECT tr_sched FROM transaction WHERE tr_date = CURRENT_DATE()";
$res2 = $conn->query($stm2);
foreach($res2 as $rows5) {
    $counter[$rows5['tr_sched']] = 0;
}