One more newbie question. About foreach..

Hello again. I Got the solution for my last mention problem. Now I can update several rows at once by one single submit action. In my form I have many records and therefor I use an checkbox to just mark those records I like to update. This work just fine in PHP/HTML5 form and I got it as I want. But the problem now is, how to recognize just those selected records by serialnumber? include('../../connect.php'); // Foreach get all given serialnumbers as I want it foreach($serialnumber as $snr){ // I got the number of serialnumbers given in the array $count = count($serialnumber); // I thought that a for loop would do the trick together with foreach // And repeat the $sql = SELECT below but that did not happen. for($i = 0; $i <= $count; $i++){ // Connect and get only those records with given serialnumber $sql = "SELECT * FROM explosive WHERE serialnumber = '$snr'"; } // End of for loop } // End of foreach loop $result = mysql_query($sql, $connect) or die(mysql_error()); $count = mysql_num_rows($result); I have tried to search in google and on PHP.net but can't fine anything that explain my problem. I like to have new $sql = SELECT queries for every given serialnumber ($snr) Thanks for your help. Karl