PDO SHOW TABLES数组

Question

Just working with this function and it's not working out as planned. It is supposed to grab all table names in a database and store them in an array. However the results of the array is doubling up the array shown in the example below:

Array ( [0] => 113340 ) 
Array ( [0] => 113340 [1] => 116516 ) 
Array ( [0] => 113340 [1] => 116516 [2] => 139431 ) 
Array ( [0] => 113340 [1] => 116516 [2] => 139431 [3] => 20731 ) 
Array ( [0] => 113340 [1] => 116516 [2] => 139431 [3] => 20731 ... )

The code that I am using:

function itemDiscontinued($dbh, $id, $detail) {
  try {
    $tableList = array();
    $result = $dbh->query("SHOW TABLES");
    while ($row = $result->fetch(PDO::FETCH_NUM)) {
      $tableList[] = $row[0];
      print_r($tableList);
    }
  }
  catch (PDOException $e) {
    echo $e->getMessage();
  }
}

Answer 1

to get all names of the tables this is much better

public function list_tables()
{
    $sql = 'SHOW TABLES';
    if($this->is_connected)
    {
        $query = $this->pdo->query($sql);
        return $query->fetchAll(PDO::FETCH_COLUMN);
    }
    return FALSE;
}