我对此表有疑问。当我想将它放在PDF的中心时，它会启动此错误：
计算表格宽度170太大
所以我的代码如下：
$searchpath = dirname(dirname(dirname(__FILE__)))."/input";
$outfile = "";
$title = "Vertical Text Alignment";
$tf=0; $tbl=0;
/* Define the column widths of the first and the second column */
$c1 = 50; $c2 = 120;$c3 = 80;
/* Define the lower left and upper right corners of the table instance.
* The table width of 200 matches the sum of the widths of the two table
* columns 80 + 120.
*/
$llx=250; $lly=800; $urx=300; $ury=50;