双层循环(九九乘法表)
<?php
echo "<table width = 800 height = 200 border = 1>"; //输出边框
for($i=1;$i<=9;$i++) //控制每行
{
echo "<tr>"; //输出一行
for($j=1;$j<=$i;$j++) //控制每列
{
echo "<td>"; //输出一列
echo $i.'*'.$j.'='.$i*$j;
echo "</td>";
}
echo "</tr>";
}
echo "</table>";
?>
【运行结果】
![](https://images2017.cnblogs.com/blog/1258709/201710/1258709-20171022170358256-233027798.png)