请问一个数据格式转换

<br />
array(5) {<br />
  [0]=><br />
  string(3) "0:3"<br />
  [1]=><br />
  string(3) "1:6"<br />
  [2]=><br />
  string(3) "2:9"<br />
  [3]=><br />
  string(3) "3:2"<br />
  [4]=><br />
  string(3) "4:4"<br />
}<br />

<br />
array(5) {<br />
  0=>3,<br />
  1=>6,<br />
  2=>9,<br />
  3=>2,<br />
  4=>4<br />
}<br />
<br />

$ar = array('0:3', '1:6', '2:9', '3:2', '4:4');<br />
<br />
foreach($ar as $v) {<br />
  $t = explode(':', $v);<br />
  $res[$t[0]] = $t[1];<br />
}<br />
<br />
print_r($res);