现有测试数据如下，要求实现如下图中的效果：
array(6) {
["visit_id"] => int(127)
["goods_id"] => int(16)
["visittime"] => int(1494399935)
["goods_name"] => string(53) "OPPO R9s 全网通4G+64G 双卡双待手机 玫瑰金"
["shop_price"] => string(6) "500.00"
}
[1] => array(6) {
["visit_id"] => int(124)
["goods_id"] => int(13)
["visittime"] => int(1494399921)
["goods_name"] => string(76) "SIEMENS/西门子 KA92NV09TI双开门家用对开门电冰箱变频旗舰款"
["shop_price"] => string(7) "4000.00"
}
[2] => array(6) {
["visit_id"] => int(123)
["goods_id"] => int(27)
["visittime"] => int(1494399903)
["goods_name"] => string(85) "爱他美白金版Aptamil 幼儿配方奶粉3段(12-36个月适用)900g(欧洲进口)"
["shop_price"] => string(6) "329.00"
}
[3] => array(6) {
["visit_id"] => int(120)
["goods_id"] => int(26)
["visittime"] => int(1494224263)
["goods_name"] => string(21) "欢乐谷免票一张"
["shop_price"] => string(5) "50.00"
}
}
还没实现之前我想这个代码不知道要O(n)呢还是更高的复杂度才能实现，细想一下，其实PHP的数组底层就是哈希实现的，如何简单利用这个特性使复杂度降到O(1)呢？
show me the code：
PHP;">
/* 浏览记录按日期分组 */
function groupVisit($visit)
{
$curyear = date('Y');
$visit_list = [];
foreach ($visit as $v) {
if ($curyear == date('Y',$v['visittime'])) {
$date = date('m月d日',$v['visittime']);
} else {
$date = date('Y年m月d日',$v['visittime']);
}
$visit_list[$date][] = $v;
}
return $visit_list;
}
说明：入参 $visit 就是上面一开始的测试数据，函数中还对用户体验做了一些优化，比如，你的浏览记录中总是显示出今年的年份，是不是感觉有点冗余，所以如果是本年份的话，年份就要隐藏起来，其他年份还是照样显示出来。不然代码会更加简洁。
好了上面的测试数据经过该函数之后，再把返回值打印出来，有：
array(3) {
[0] => array(6) {
["visit_id"] => int(127)
["goods_id"] => int(16)
["visittime"] => int(1494399935)
["goods_name"] => string(53) "OPPO R9s 全网通4G+64G 双卡双待手机 玫瑰金"
["shop_price"] => string(6) "500.00"
}
[1] => array(6) {
["visit_id"] => int(124)
["goods_id"] => int(13)
["visittime"] => int(1494399921)
["goods_name"] => string(76) "SIEMENS/西门子 KA92NV09TI双开门家用对开门电冰箱变频旗舰款"
["shop_price"] => string(7) "4000.00"
}
[2] => array(6) {
["visit_id"] => int(123)
["goods_id"] => int(27)
["visittime"] => int(1494399903)
["goods_name"] => string(85) "爱他美白金版Aptamil 幼儿配方奶粉3段(12-36个月适用)900g(欧洲进口)"
["shop_price"] => string(6) "329.00"
}
}
["05月08日"] => array(1) {
[0] => array(6) {
["visit_id"] => int(120)
["goods_id"] => int(26)
["visittime"] => int(1494224263)
["goods_name"] => string(21) "欢乐谷免票一张"
["shop_price"] => string(5) "50.00"
}
}
}
对的，这正是我想要的效果。
以上所述是小编给大家介绍的PHP 实现浏览记录并按日期分组，希望对大家有所帮助。程序员遇到问题都会上（编程之家jb51.cc）查找问题解答方法！如果觉得站点还不错，随手转发给程序员朋友一下！
