Question

I just don’t get it where is the problem but here’s the error:

Fatal error: Can’t use function return value in write context in
D:\wamp\www\system\classes\database.class.php on line 70

Code:

public function query($sql) {
        if(!is_string() or empty(trim($sql))) {
            throw new Exception('No sql statement was entered.');
        }

        $query = @mysql_query($sql);

        if(!$query) {
            throw new Exception('Query could not be executed because of an error: [#' . mysql_errno() . '] - ' . mysql_error());
        }

        return $query;
    }

Line 70:

 if(!is_string() or empty(trim($sql))) {

Answer 1

It’s right there in the manual for the empty function: http://php.net/empty

empty() only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).

To fix it you need to do something like:

$sql = trim($sql);
if(!is_string() or empty($sql)) {
...
}