PHP修改TABLE结构 要怎么写

如果我要把6号7号 两列删除，PHP代码要怎么写

<TABLE class=ntable>
<TBODY>
<TR>
<TH class=tx>序号</TH>
<TH>1号</TH>
<TH>2号</TH>
<TH>3号</TH>
<TH>4号</TH>
<TH>5号</TH>
<TH>6号</TH>
<TH>7号</TH></TR>
<TR>
<TD class=tx>1</TD>
<TD class=left>1号</TD>
<TD>2号</TD>
<TD>3号</TD>
<TD>4号</TD>
<TD>5号</TD>
<TD>6号</TD>
<TD>7号</TD></TR>
<TR>
<TD class=tx>2</TD>
<TD class=left>1号</TD>
<TD>2号</TD>
<TD>3号</TD>
<TD>4号</TD>
<TD>5号</TD>
<TD>6号</TD>
<TD>7号</TD></TR>
<TR>
<TD class=tx>3</TD>
<TD class=left>1号</TD>
<TD>2号</TD>
<TD>3号</TD>
<TD>4号</TD>
<TD>5号</TD>
<TD>6号</TD>
<TD>7号</TD></TR>
</TBODY></TABLE>

js直接删除就行。有帮助麻烦点个采纳【本回答右上角】，谢谢~~有其他问题可以继续交流~

<TABLE class=ntable>
    <TBODY>
        <TR>
            <TH class=tx>序号</TH>
            <TH>1号</TH>
            <TH>2号</TH>
            <TH>3号</TH>
            <TH>4号</TH>
            <TH>5号</TH>
            <TH>6号</TH>
            <TH>7号</TH>
        </TR>
        <TR>
            <TD class=tx>1</TD>
            <TD class=left>1号</TD>
            <TD>2号</TD>
            <TD>3号</TD>
            <TD>4号</TD>
            <TD>5号</TD>
            <TD>6号</TD>
            <TD>7号</TD>
        </TR>
        <TR>
            <TD class=tx>2</TD>
            <TD class=left>1号</TD>
            <TD>2号</TD>
            <TD>3号</TD>
            <TD>4号</TD>
            <TD>5号</TD>
            <TD>6号</TD>
            <TD>7号</TD>
        </TR>
        <TR>
            <TD class=tx>3</TD>
            <TD class=left>1号</TD>
            <TD>2号</TD>
            <TD>3号</TD>
            <TD>4号</TD>
            <TD>5号</TD>
            <TD>6号</TD>
            <TD>7号</TD>
        </TR>
    </TBODY>
</TABLE>
<script>
    var trs = document.querySelector('.ntable').querySelectorAll('tr');
    for (var tr of trs) {
        var cell = tr.querySelectorAll('td,th');
        tr.removeChild(cell[6]);
        tr.removeChild(cell[7]);
    }
</script>

<script>  
    var table = document.getElementById("tableid");//获得要操作的table对象
    var row = table.rows[3];//先获取到要操作的第几行（3代表第四行），
    row.deleteCell (0);//删除掉第三行的第一列
</script>

在数组中unset($arr[6])