这篇文章主要介绍了PHP 实现浏览记录并按日期分组的实例代码,非常不错,具有参考借鉴价值,需要的朋友可以参考下

现有测试数据如下,要求实现如下图中的效果:

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" } }

PHP 实现浏览记录并按日期分组的方法-php教程-PHP中文网

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:

/* 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(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" } } }

对的,这正是我想要的效果。

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