korrektur:
$qry = "SELECT gruppe FROM konflikt WHERE person='$usr'";
$result = mysql_query($qry) or die(mysql_error());
for($j=0; $j < mysql_num_rows($result); $j++)
{
$gruppe = mysql_result($result, $j, 0);
$qry = "SELECT person FROM konflikt WHERE gruppe='$gruppe'";
$result_kp = mysql_query($qry) or die(mysql_error());
for($z=0; $z < mysql_num_rows($result_kp); $z++) $konflikt_personen[] = mysql_result($result_kp, $z, 0);
}