PHP+MySQL统计该库中每个表的记录数并按递减顺序排列的方法

";
  }
}
$dsn = "mysql:host={$host};port={$port};dbname={$dbname}";
$opts = array(PDO::ATTR_ERRMODE=>PDO::ERRMODE_EXCEPTION,PDO::ATTR_AUTOCOMMIT=>0);
try {
  $pdo = new PDO($dsn,$username,$password,$opts);
}catch(PDOException $e){
  echo $e->getMessage();
}
//有查询结果
function query($sql)
{
  global $pdo;
  $stmt = $pdo->query($sql);
  $data = $stmt->fetchAll(Pdo::FETCH_BOTH);
  return $data;
}
//无查询结果
function execute($sql)
{
  global $pdo;
  $affect_rows = $pdo->query($sql);
  return $affect_rows;//影响条数
}
$tables = query("show tables");
$sort_data = array();
foreach($tables as $table)
{
  //表记录条数
  $count_sql = "select count(*) as num from {$table[0]}";
  $stmt = $pdo->query($count_sql);
  $info = $stmt->fetch(Pdo::FETCH_BOTH);
  $pad_table = str_pad($table[0],25,' ');
  $sort_data[] = array('table'=>$pad_table,'num'=>$info['num']);
  $sort_index[] = $info['num'];
}
array_multisort($sort_index,SORT_DESC,$sort_data);
foreach($sort_data as $val)
{
  $row_str = <<