Undefined array key #8
Description
Hi cant register to database from register form get this error Undefined array key "user_id" in /welcome.php on line 62 i know user_id is a value not a key can you help fix this please, the lines from welcome.php 62
$sql = "SELECT * FROM users WHERE id='{$_SESSION["user_id"]}'";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
while ($row = mysqli_fetch_assoc($result, )) {