php查找mysql数据库中的所有表名

show databases;
show tables from db_name;

show columns from table_name from db_name;
show index from talbe_name [from db_name];

show status;
show variables;

show [full] processlist;
show table status [from db_name];

show grants for user;

$server = 'localhost';  
$user = 'root';  
$pass = '';  
$dbname = 'dayanmei_com';  
$conn = mysql_connect($server,$user,$pass);  
if(!$conn) die("数据库系统连接失败！");  
mysql_select_db($dbname) or die("数据库连接失败！");  
$result = mysql_query("SHOW TABLES");  
while($row = mysql_fetch_array($result))  
{  
echo $row[0]."";  
mysql_free_result($result);  

}