php循环table实现一行两列显示的方法

<table width="100%" border="0" cellspacing="1" cellpadding="0" style="background:#CCC">
 <tr>
  <td align="center" bgcolor="#FFFFFF">第一列</td>
  <td align="center" bgcolor="#FFFFFF">第二列</td>
 </tr>
 <tr>
  <"htmlcode">

<"Hello world. It's a beautiful day.";
print_r (explode(" ",$str));
"htmlcode">

Array
(
[0] => Hello
[1] => world.
[2] => It's
[3] => a
[4] => beautiful
[5] => day.
)