Looping through MySQL results and saving values to a $_SESSION - php

Question

I am trying to store each column name in my database into its own $_SESSION. For example, say my column names are column_one, column_two, column_three, column_four, and column_five. I want these to be stored in a $_SESSION like $_SESSION['column_one'], $_SESSION['column_two'], etc. I am trying to do this in a loop but I have not been successful. How would I setup the loop to achieve this?
$query = "SELECT * FROM table WHERE user_id = $id";
$result = mysqli_query($dbc, $query);
$num = mysqli_num_rows($result);
if ($num == 1) {
//User was found
while($row = mysqli_fetch_array($result, MYSQLI_BOTH)) {
$_SESSION['user_id'] = $row['user_id'];
}
}

Answer 1

Could you try this:
$id = mysqli_real_escape_string($dbc,$id);
$query = "SELECT * FROM table WHERE user_id = $id";
$result = mysqli_query($dbc, $query);
$num= mysqli_num_rows(result);
if ($num == 1) {
$row = mysqli_fetch_assoc($result);
$_SESSION['UserData'] = $row;
}else{
//handle error or user not found
}
echo '<pre>';
print_r($_SESSION['UserData']);
echo '</pre>';
You don't have necessity of use while or another loop, so is just one row

Answer 2

Something like this should work:
while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
foreach($row as $column => $value) {
$_SESSION[$column] = $value;
}
}
Extra advice for safeguarding against SQL injection, the following two lines:
$id = mysqli_real_escape_string($dbc, $id);
$query = "SELECT * FROM table WHERE user_id = '$id'";
Update:
Thanks to EmilioGort who pointed out the missing connection parameter in mysqli_real_escape_string. See mysqli_real_escape_string docs.

Answer 3

While the other answers proposed a way to do, I'd strongly propose to not do this at all. Why?
First of all $row contains all details of the user in a well defined array form. It is generally good to keep this structure well prepared.
More important: Flattening $row might force name clashes like so:
Suppose $row has a property userName and somewhere else in your application you eventually set
$_SESSION[ 'userName' ] = $newUserName;
The new assignment to $_SESSION[ 'userName' ] might unintentionally change the property saved during the login process.
You might argue "Right now, my code doesn't use userName in $_SESSION'. Right! Unfortunately, you might use just this name for something else many month later on...
A better solution
I'd save the user detail like this:
$_SESSION[ 'sys$userDetails' ] = $row;
Imagine the prefix sys$ as being an indicator for framework generated properties of your session.
Thus, business logic related session data shouldn't have the sys$ prefix.