How to nest

How to nest? I have never seen the rookie PHP language & #183; & #183; the director told me to do a website now with a poor link jump & #183; & #183; & nbsp; & lt ;? Php & nbsp; $ id =$ _ GET [& quot; id & quot;]; & nbsp; $ How to nest sq?
I have never seen the rookie PHP language ··
The director asked me to make a website. now I have a link jump ··

$ Id = $ _ GET ["id"];
$ SQL = "select list from list where id = $ id ";

$ Query1 = mysql_query ($ SQL );
$ Slq1 = "select content from $ query ";
$ Query = mysql_query ($ sql1 );

While ($ array = mysql_fetch_array ($ query )){
?>
No More

Run the command that SLQ1 is not defined ··
$ Slq1 = "select content from $ query ";
$ Query how to write ·

------ Solution --------------------
$ SQL = "select list from list where id =". $ id;

Isn't that true?
------ Solution --------------------
$ Slq1 = "select content from $ query ";
$ Query = mysql_query ($ sql1 );

The variable name is incorrect.