Using Session Variables To Insert Data To MYSQL Database?

I am having problems getting PHP to insert data into a MYSQL data base. I am using the following variations of syntax.

mysql_query("INSERT INTO table member VALUES ('$var1', '$var2', '$var3')")
or die("couldn't add new user");

and also with session variables as well

mysql_query("INSERT INTO table member VALUES ('$_SESSION[$var1]', '$_SESSION[$var2], '$_SESSION[$var3]')")or die("couldn't add new user");

i have put all these through a print statement to make sure the variables ae set and they print in the same block of code so i have no idea what i am doing wrong.?



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Insert Query Doesn't Insert Data To Mysql Database Table?

i have a recipe table and ingredient table the primary key of both tables are auto increament and primary key of recipe is foreign key in ingredient. i post data from html to php.Note that my ingredient textboxes are generated dynamically and successfully post the data to php script. posted data is correct when i insert this data to table my query working fine but data is not added to mysql table. my code and output is

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[Code].....

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here is what needs being added to database.

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Here is my db connection file code in case it helps, this is included using the php include in the registration page. All i need help in how i got about checkning if username and email exists or not and if all ok put info in db or give an error to say it already exists.

<?php

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