MySQLI Prepared Statement: num_rows & fetch_assoc

Question

Below is some poorly written and heavily misunderstood PHP code with no error checking. To be honest, I\'m struggling a little getting my head around the maze of PHP->MySQLi

Answer 1

I searched for a long time but never found documentation needed to respond correctly, but I did my research.

$stmt->get_result() replace $stmt->store_result() for this purpose. So, If we see

$stmt_result = $stmt->get_result();
var_dump($stmt_result);

we get

object(mysqli_result)[3]
  public 'current_field' => int 0
  public 'field_count' => int 10
  public 'lengths' => null
  public 'num_rows' => int 8  #That we need!
  public 'type' => int 0

Therefore I propose the following generic solution. (I include the bug report I use)

#Prepare stmt or reports errors
($stmt = $mysqli->prepare($query)) or trigger_error($mysqli->error, E_USER_ERROR);

#Execute stmt or reports errors
$stmt->execute() or trigger_error($stmt->error, E_USER_ERROR);

#Save data or reports errors
($stmt_result = $stmt->get_result()) or trigger_error($stmt->error, E_USER_ERROR);

#Check if are rows in query
if ($stmt_result->num_rows>0) {

  # Save in $row_data[] all columns of query
  while($row_data = $stmt_result->fetch_assoc()) {
    # Action to do
    echo $row_data['my_db_column_name_or_ALIAS'];
  }

} else {
  # No data actions
  echo 'No data here :(';
}
$stmt->close();