下边的代码只有case1 可以执行，为什么啊？

<?php
require('conn.php');
switch($submit){
case $submit1;
        $char_sql1="insert into temp select * from computer where name='$name'";
        $result=mysql_db_query("computermanage",$char_sql1,$link_message);
        break;
case $submit2;
        $char_sql2="insert into temp select * from computer where department='$department'";
        $result=mysql_db_query("computermanage",$char_sql2,$link_message);
        break;
case $submit3;
        $char_sql3="insert into temp select * from computer where model='$model'";
        $result=mysql_db_query("computermanage",$char_sql3,$link_message);
        break;
case $submit4;
        $char_sql4="insert into temp select * from computer where purpose='$purpose'";
        $result=mysql_db_query("computermanage",$char_sql4,$link_message);
        break;
case $submit5;
        $char_sql5="insert into temp select * from computer where buydate='$buydate'";
        $result=mysql_db_query("computermanage",$char_sql5,$link_message);
        break;
case $submit6;
        $char_sql6="insert into temp select * from computer where discarddate='$discarddate'";
        $result=mysql_db_query("computermanage",$char_sql6,$link_message);
        break;
case $submit7;
        $char_sql7="insert into temp select * from computer where id !=0 ";
        $result=mysql_db_query("computermanage",$char_sql7,$link_message);
        break;
        };
        Header("Location: select.php");

?>

只有case $submit1可以执行，其余的都没有信息，那位兄弟能帮我看看啊。我刚学php，请多多指教！谢谢了啊

case $submit1;
case 后面是冒号,不是逗号

case $submit1: