$sql2="create table '$user_name' (id int(5) not null auto_increment primary key, name varchar(12) not null,mail varchar(30) not null,phone varchar(14) not null,address varchar(30) not null)";
=>
$sql2="create table $user_name (id int(5) not null auto_increment primary key, name varchar(12) not null,mail varchar(30) not null,phone varchar(14) not null,address varchar(30) not null)";
=>
$sql2="create table $user_name (id int(5) not null auto_increment primary key, name varchar(12) not null,mail varchar(30) not null,phone varchar(14) not null,address varchar(30) not null)";
create table ss@ss (id int(5) not null auto_increment primary key, name varchar(12) not null,mail varchar(30) not null,phone varchar(14) not null,address varchar(30) not null)
create table `$user_name`
(
id int(5) not null auto_increment primary key,
name varchar(12) not null,
mail varchar(30) not null,
phone varchar(14) not null,
address varchar(30) not null
)
";
加`试试呢?