Notice: object of class mysqli_result could not be converted to int

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I have this code:

$var0 = 0;
$var1 = 1;
global $var0;
global $var1;
$parentQuery = $db->prepare("SELECT * FROM category WHERE parent = ? ORDER BY category");
$parentQuery->bind_param('i', $var0);
$parentQuery->execute();
$result1 = $parentQuery->get_result();
<label for="parent" class="form-label">parent:</label>
      <select class="form-select" name="parent">
        <option value=""></option>
        <?php while($p = mysqli_fetch_assoc($result1)): ?>
          <option value="<?=$p['id'];?>"<?=($result1 == $p['id']?' selected':'');?>><?=$p['category'];?></option>
        <?php endwhile; ?>
      </select>

I am getting the options correctly, but I am getting this error: "Notice: Object of class mysqli_result could not be converted to int" beside each option... I don't know why I am getting this error, how to fix it?

What I have tried:

I don't know why I am getting this error, how to fix it?

Posted 1-Mar-23 13:48pm

FRS4002

Updated 1-Mar-23 17:27pm

v3

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Dave Kreskowiak · Answer 1 · 2023-03-01T17:27:00

Read the documentation on get_result[^]. It returns a mysqli_result object, not an integer. Now go off and read the documentation on mysqli_result[^]. That mysqli_result object ends up in your $result1 variable, which you then pass to something else that is not expecting a mysqli_result object, but an integer.

That's why you're getting the error.