mysqli_query syntax error with $_SESSION used - php

Question

I had got the error like this
Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING)
Here is my code (I used $_SESSION to get variable from the other page.)
$sql="insert into data(name,sex,time,suggest,eat,problem,student_suggest,tutor_suggest,other_suggest)
values('$_SESSION['name']','$_SESSION['gender']','$_SESSION['time']','$_SESSION['suggest']','$_SESSION['eat']', '$_SESSION['problem']','$_SESSION['student']','$_SESSION['tutor']','$_SESSION['other']')";
mysqli_query($cn,$sql) or die(mysqli_error($cn));

Answer 1

You need to proper write down variables.
It can't be :
values('$_SESSION['name']',
It has to be:
values('".$_SESSION['name']."',
Another good approach is to use PDO
$dbh = new PDO('mysql:host=localhost;dbname=data', $user, $pass);
$stmt = $dbh->prepare("INSERT INTO data (name, sex) VALUES (:name, :sex)");
$stmt->bindParam(':name', $_SESSION['name']);
$stmt->bindParam(':sex', $_SESSION['gender']);
$stmt->execute();

Answer 2

You are using single quote in worng sequnence and this generated wrong code ..
You could use string concat for avoid the problem
but be carefulfor sqlijcection using php var inside sql, (you should use PDO and param binding.
Anyway related to your question
$sql="insert into data(name,sex,time,suggest,eat,problem,student_suggest,tutor_suggest,other_suggest)
values(" . $_SESSION['name'] . ","
. $_SESSION['gender'] . ","
. $_SESSION['time'] . ","
. $_SESSION['suggest'] . ","
. $_SESSION['eat']', . ","
. $_SESSION['problem'] . ","
. $_SESSION['student'] . ","
. $_SESSION['tutor'] . ","
. $_SESSION['other'] . ")";