数组转换归拢

$a = Array (<br />  Array( 'id' => 9,  'ti' => '我' ),<br />  Array( 'id' => 10, 'ti' => '们' ),<br />  Array( 'id' => 11, 'ti' => '中' ),<br />  Array( 'id' => 11, 'ti' => '国' )<br />);<br />$res = array();<br />foreach($a as $r) {<br />  if(isset($res[$r['id']])) $res[$r['id']] .= $r['ti'];<br />  else $res[$r['id']] = $r['ti'];<br />}<br />print_r($res);

Array<br />(<br />    [9] => 我<br />    [10] => 们<br />    [11] => 中国<br />)<br /><br />