今天有人和我说pdo没办法show databases，实测可以

<?php 


$host = "127.0.0.1";
$port = 3306;
$username = ‘root‘;
$password = ‘xxxx‘;


$dsn = "mysql:host={$host};port={$port};";






$dbconn = array(
     ‘dns‘=>$dsn,
     ‘dbuser‘=>$username,
     ‘dbpwd‘=>$password
);
$iokcount = 0;


     try{
      $db = new PDO($dbconn[‘dns‘],$dbconn[‘dbuser‘],$dbconn[‘dbpwd‘]);
      $sql = "show databases";
$st = $db->query($sql);


$rs = $st->fetchAll();


//显示所有记录
foreach($rs as $rows)
{
print_r($rows);
}
     $db = null;


     }catch(PDOException  $e)
     {
          echo $e->getMessage();
     }
 
?>