simplified: mysqli num_rows not working

Question

How do I output the number of returned rows using mysqli? My code below shows 0 though a while loop (while $s->fetch() echo $uid;) shows 2 results;

$m = new          


        

Answer 1

You'll have to call mysqli_stmt::store_result() after mysqli_stmt::execute() and before fetch in order to know mysqli_stmt::num_rows:

$s->execute();
$s->store_result();
print_r($s->num_rows);

PHP Document on num_rows

PHP Document on store_result()