我对数据库获取的结果有点挣扎
假设我有一些行
array('id'=>1, 'surname'=>'rossi', 'name'=>'mario', 'group'=>'admin'),
array('id'=>2, 'surname'=>'rossi', 'name'=>'giovanni', 'group'=>'user'),
array('id'=>3, 'surname'=>'verdi', 'name'=>'luigi', 'group'=>'user'),
array('id'=>4, 'surname'=>'verdi', 'name'=>'franco', 'group'=>'guest'),
array('id'=>5, 'surname'=>'bianchi', 'name'=>'mario', 'group'=>'guest')
现在我该怎么做才能将这 5 行放入分组数组中？
例：
user = array(
array('id'=>2, 'surname'=>'rossi', 'name'=>'giovanni', 'group'=>'user'),
array('id'=>3, 'surname'=>'verdi', 'name'=>'luigi', 'group'=>'user'))
guest = array(
array('id'=>4, 'surname'=>'verdi', 'name'=>'franco', 'group'=>'guest'),
array('id'=>5, 'surname'=>'bianchi', 'name'=>'mario', 'group'=>'guest'))
admin = array(
array('id'=>1, 'surname'=>'rossi', 'name'=>'mario', 'group'=>'admin'))
// get query result
$result = mysql_query(...);
// prepare the target array
// it will hold user groups having group name as key
// eg. "user" => Array(), "guest" => Array()
$users = Array();
// whlile fetching rows from the result, add each row into $row["group"] key of target
while($row = mysql_fetch_assoc($result))
$users[$row["group"]][] = $row;
// free the mysql result
mysql_free_result($result);
更新：实际上不需要在目标$user变量中定义键。 为了使代码可读和可管理，对一般结构进行注释就足够了。