PHP source code for batch review and batch deletion

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<form name="form1" method="post" action="manage.php?act=sub">
<input type="checkbox" name="mm[]" value="<?=$row['0']?>" onClick="checkItem(this, 'mmAll')">
<!--checkbox 实现选择多条记录-->
<input type="submit" name="Submit" value="删除" onClick="return(confirm('确认要删除吗？'))">
</form>
 
//JS实现全选/不全选的代码
<script language=Javascript>
function checkAll(e, itemName)
{
var aa = document.getElementsByName(itemName);
for (var i=0; i<aa.length; i++)
aa[i].checked = e.checked;
}
function checkItem(e, allName)
{
var all = document.getElementsByName(allName)[0];
if(!e.checked) all.checked = false;
else
{
var aa = document.getElementsByName(e.name);
for (var i=0; i<aa.length; i++)
if(!aa[i].checked) return;
all.checked = true;
}
}
</script>
 
$num=$_POST['mm'];//这里得到一个POST数组；
$str=implode(',', $num); 把数组值分开；
$query="delete from `ad` where `id` IN(${str});"; //SQL语法，IN条件语句；