mysqli num_rows 返回零

Question

i'm new to mysqli trying to select everything from a table but num_rows function is returning 0 what am i doing wrong?

here is my code

    <?php $conn = new mysqli('localhost', 'root', '', 'paa');
    $sql='SELECT * FROM utilisateurs';
    $rs=$conn->query($sql);
    if($rs === false) {
    trigger_error('Wrong SQL: '.$sql.'Error:'.$conn>error,E_USER_ERROR);
      } else {
      $rows_returned = $rs->num_rows;
      echo $rows_returned;
      }

   ?>

Answer 1

Apart from the $conn>error,E_USER_ERROR which should be $conn->error,E_USER_ERROR there is no error in your code. Maybe the table is empty?

Answer 2

This function returns the number of rows found by the query. 0 means that your query returned no rows.

The question why did it so is neither on topic not have any means to be answered.