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if(!$rows) $rows=20;
if($search==1) $and=" AND aclass='$aclass'";//按班级查询
$T1=strtotime("$time1");
$T2=strtotime("$time2");
if($search==2) $and=" AND posttime>='$T1' AND posttime<='$T2'";//按考试时段查询
if($search==3) $and=" AND number>='$number1' AND number<='$number2'";//按考号范围查询
$min=($page-1)*$rows;
$i=$min;
unset($listdb);
print "here";
$query = $db->query("SELECT SQL_CALC_FOUND_ROWS * FROM {$_pre}student WHERE form_id='$id' $and ORDER BY total_fen DESC,totaltime ASC LIMIT $min,$rows");