ProjectSend R561 SQL INJ Analysis

 1 ......
 2 if (isset($_GET[‘id‘])) {
 3     $client_id = mysql_real_escape_string($_GET[‘id‘]);
 4     /**
 5      * Check if the id corresponds to a real client.
 6      * Return 1 if true, 2 if false.
 7      **/
 8     $page_status = (client_exists_id($client_id)) ? 1 : 2;
 9 }
10 else {
11     /**
12      * Return 0 if the id is not set.
13      */
14     $page_status = 0;
15 }
16 
17 /**
18  * Get the clients information from the database to use on the form.
19  */
20 if ($page_status === 1) {
21     $editing = $database->query("SELECT * FROM tbl_users WHERE id=$client_id");
22 ......