Code stops running

[phpcode]

<?
mysql_connect ("localhost", "root", "lllllll");
mysql_select_db ("db");


$usernameF = $_POST['usernameF'];
$action = $_POST['action'];

if ($usernameF != "" and $action == "Lost Password") {
$SQLquery = "select name from userslist where instr(email,'$usernameF') > 0 and length(email) = length('$usernameF')";
$result = mysql_query ($SQLquery)
  		or die ("Query failed");
if (mysql_num_rows($result) > 0) {
	for ($n = mysql_num_rows ($result) - 1; $n >=0; $n--) {
		if (!mysql_data_seek ($result, $n)) {
       			printf ("Cannot seek to row %d\n", $n);
       		continue;
       		}
    		if(!($row = mysql_fetch_object ($result)))
		echo "t1";
       			continue;
		}

	$passwordF = strtoupper(substr(ereg_replace("[^A-Z0-9]", "", crypt(time())) .
                         ereg_replace("[^A-Z0-9]", "", crypt(time())) .
                         ereg_replace("[^A-Z0-9]", "", crypt(time())),
                     0, );
	$SQLquery = "update userslist set passwd = '".crypt($passwordF,substr($usernameF,0,2))."' where instr(email,'$usernameF') > 0 and length(email) = length('$usernameF') and name = '$row->name'";
		$result = mysql_query ($SQLquery)
  				or die ("Query2 failed");


	$recipient = $usernameF;
	$subject = "Login Details";
	mail($recipient, "$subject", "Your password has been changed to :- $passwordF", "From: [email protected]\nContent-Type: text/html; charset=iso-8859-1\n", "[email protected]");
echo "
<script>
location.href='?display=Member%20Password%20Sent&menu=nonmenu';
</script>";

}
}
?>

 

When I run this code it stops but doesn't tell me why. I checked the error log but nothing is there and I have changed the error reporting. Can anyone see whats wrong?

[priti]

Make sure following things:

 

1. $usernameF is not empty.

2. print this query and try to run it on sql mode to make sure it is behaving as expected.

3.why

 

<script>

location.href='?display=Member%20Password%20Sent&menu=nonmenu';

</script>"; ?????

 

they to redirect to a correct page after login with header() in php.

 

Thanks