Question

This is the code I have, but I get this error when I try to get variable from the url: Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource

The URL variable DEVID is a long string of characters, numbers, dashes, and underscores. Any ideas on what is wrong?

<?php
$con = mysql_connect("server","username","password");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("database", $con);

$result = mysql_query("SELECT * FROM $user WHERE DEVID=$DEVID");


while($row = mysql_fetch_array($result))
  {
  if (($row["FN"]) == NULL){
echo '<meta http-equiv="refresh" content="1;url=../register/default.php?user=';
echo $_GET["user"];
echo '&DEVID=';
echo $_GET["DEVID"];
echo '">Please hold, we are taking you to the registration page.<br/><br/>';
}

  }


mysql_close($con);
?>

Answer 1

If $DEVID is a VARCHAR field then you’ll need single quotes around it in your SQL query:

SELECT * FROM $user WHERE DEVID='$DEVID'