Profile Code gives odd error

[Talon]

For some reason the code I am in the begining stages of programing, keeps generating a unique error.

Fatal error: Can't use function return value in write context in /profile.php on line 4

I get this error with the code below. I am truley frustrated, as line 4 has nothing of the sort, and it isn't my config file because that is just DB information.

<?PHP
require('config.php');

if(isset(secure($_GET['member_id'])))

{

$member_id = (INT)$_GET['member_id'];

$member_info = mysql_query("SELECT user, contact, image, bio FROM team WHERE id = '$member_id' LIMIT 1");

if(mysql_num_rows($member_info) > 0)

{

// we can go ahead and assign it to an array because this user exists

$profile_info = mysql_fetch_assoc($member_info);

echo "<center>

<h2>$profile_info[user]</h2>

<pre>$profile_info[contact]</pre><br>

<img src='$profile_info[image]' width='150' heigth='150'><br>

<br><b>Contact:</b><br>
echo "<p>$profile_info[bio]</p>";
</center>
";
}
else
}
echo "Member ID incorrect";
}

?>

[NogDog]

The argument to the isset() function must be a variable. You are instead providing a function call as the argument, thus you are effectively trying to check if the return value of the function is set, therefore generating that error.

[Talon]

So if I put a variable for $GET['member_id'] (such as $id = $GET['member_ID']) it should turn out alright. Sorry if this sounds like a very akwardly worder question, it is just I am trying to learn as much PHP as possible, and I hadn't ever used the isset function.

[NogDog]

If you just want to know whether $GET['member'] is set, then simply do the following (without using the secure() function):

if(isset($_GET['member'])) {