有这么一个需求，需要把多条数据合并为一条。
$data = array();
$data[] = array(id => 123, name => money, before_save => 10, after_save => 20, create_date => 2014-10-23);
$data[] = array(id => 123, name => money, before_save => 20, after_save => 30, create_date => 2014-10-24);
$data[] = array(id => 123, name => money, before_save => 30, after_save => 50, create_date => 2014-10-25);
$data[] = array(id => 123, name => duration, before_save => 10, after_save => 20, create_date => 2014-10-23);
$data[] = array(id => 123, name => duration, before_save => 20, after_save => 30, create_date => 2014-10-24);
$data[] = array(id => 456, name => money, before_save => 60, after_save => 70, create_date => 2014-10-26);
$data[] = array(id => 456, name => money, before_save => 70, after_save => 80, create_date => 2014-10-27);
$data[] = array(id => 456, name => money, before_save => 80, after_save => 100, create_date => 2014-10-28);
$data[] = array(id => 456, name => duration, before_save => 60, after_save => 70, create_date => 2014-10-26);
$data[] = array(id => 456, name => duration, before_save => 70, after_save => 80, create_date => 2014-10-27);
$data[] = array(id => 456, name => duration, before_save => 80, after_save => 100, create_date => 2014-10-28);
将上面id和name相同的合并为一条数据。
合并规则是：
before_save的值为create_date最小的那一条的before_save值
after_save的值为create_date最大的那一条的after_save值
create_date的值取最大值
例如前三条数据得出结果需要为
$data[] = array(id => 123, name => money, before_save => 10, after_save => 50, create_date => 2014-10-25);
上面结果一共会得出4条数据，分别是
$returndata[0] = array(id => 123, name => money, before_save => 10, after_save => 50, create_date => 2014-10-25);
$returndata[1] = array(id => 123, name => duration, before_save => 10, after_save => 30, create_date => 2014-10-24);
$returndata[2] = array(id => 456, name => money, before_save => 60, after_save => 100, create_date => 2014-10-28);
$returndata[3] = array(id => 456, name => duration, before_save => 60, after_save => 100, create_date => 2014-10-28);
小弟刚学php没多久，不太熟悉，求大神帮忙
------解决思路----------------------
本帖最后由 xuzuning 于 2014-11-02 18:55:54 编辑 $res = array();
foreach($data as $t) $res[$t['id']][$t['name']][$t['create_date']] = $t;
$returndata = array();
foreach($res as $t) {
foreach($t as $r) {
ksort($r);
$v = array_pop($r);
$p = array_shift($r);
$v['before_save'] = $p['before_save'];
$returndata[] = $v;
}
}
print_r($returndata);