$sql="SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '数据库名称'";	$r=$pdo->query($sql,2);	foreach($r as $v){		//if($v['TABLE_NAME']!='monxin_index_user'){continue;} 代码来源 梦行云软件		$sql="alter table `".$v['TABLE_NAME']."` convert to character set utf8";		if($pdo->exec($sql)){echo $sql.'
';}			}