现有测试数据如下，要求实现如下图中的效果：
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array(4) {
[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"
}
[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"
}
}
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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：
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/* 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;
}
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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：
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array(2) {
["05月10日"] => 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"
}
}
}
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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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://www.cnblogs.com/hackbee/p/6838089.html