我写了一个就是在html中写连接数据库并且创建一个数据库和表，可是我始终不知道怎样将$table作为变量让他成为表明实验了好多总写法

<?php
   $file="date/conn.php";
    if(!is_writable($file)){
        echo"<font color=red>不能够进行读写</font>";
    }
   else{
       echo "<font color=green>能够进行读写</font>";

       if(isset($_POST['tj'])){
        $conn.="<?php";
        $conn.="\n";
        $conn.='$host="'.$_POST['sever'].'";';
        $conn.="\n";
        $conn.='$user="'.$_POST['user'].'";';
        $conn.="\n";
        $conn.='$pass="'.$_POST['pass'].'";';
        $conn.="\n";
        $conn.='$db="'.$_POST['db'].'";';
        $conn.="\n";
        $conn.='$table="'.$_POST['table'].'";';
        $conn.="\n";
        $conn.="?>";

      $str=fopen("date/conn.php","w");
      fwrite($str,$conn);
       }
 //  ==========================================>
         require("date/conn.php");

       if(  mysql_connect($host,$user,$pass)){echo "成功";} else{ echo "失败";}
        if(   mysql_query("CREATE DATABASE $db"))  {echo "成功";} else{ echo "失败";}
                 mysql_select_db($db);
          $sql_query='CREATE TABLE `$table` ('   //问题所在处怎样让变脸$table让数据库识别，
           //想了好几种方法"'.$table.'"  ,'".$table."'都无法成为让mysql识别这个变量从而见表
        . ' `id` INT NULL AUTO_INCREMENT PRIMARY KEY, '
        . ' `companyName` VARCHAR(255) NULL, '
        . ' `name` VARCHAR(255) NOT NULL, '
        . ' `email` VARCHAR(255) NULL, '
        . ' `tel` VARCHAR(15) NOT NULL, '
        . ' `fax` VARCHAR(15) NULL, '
        . ' `add` VARCHAR(255) NOT NULL, '
        . ' `business` VARCHAR(25) NOT NULL, '
        . ' `time` VARCHAR(255) NULL, '
        . ' `requirement` VARCHAR(255) NOT NULL, '
        . ' `when` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP'
        . ' )'
        . ' TYPE = innodb;';

            if(  mysql_query($sql_query)){echo "成功";} else{ echo "失败";}



   }





?>
<div id="head">
                        <div id="body">
                        <fieldset><legend>欢迎进入Mysql连接</legend>
                        <form method="post" action="for.php" name="myform">
                         <div  id="sever">  服务器名：<input type="text" name="sever"  /></div>
                         <div  id="user">   输入账号：<input type="text" name="user"  /> </div>
                         <div  id="pass">   输入密码：<input type="text" name="pass"  />             </div>
                         <div   id="db">    数据库名：<input type="text" name="db"  /> </div>


                        <div   id="button">     <button name="tj"  type="submit" size="30" >连接  </button>    </div>
                         </form>
                         </fieldset>
                      </div>
                </div>