php - Warning: Creating default object from empty value -


i'm checking whether or not username , email user has entered taken. works fine; if it's in use doesn't register account , informs user, if it's not taken account made, however, warning message regardless.

this error coming from, based off tutorials have been using code should work fine:

$sql = "select username, email users username = $username , email = $email"; $result = $conn->query($sql);  if ($result->num_rows = 0) 

change : if ($result->num_rows = 0)//assignment to:  if ($result->num_rows == 0)//condition checking.

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