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PHP 实现浏览记录并按日期分组

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Lepaskan： 2023-03-24 06:02:01

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这篇文章主要介绍的内容是关于PHP 实现浏览记录并按日期分组，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

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"
 } 
}

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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：

/* 浏览记录按日期分组 */
function groupVisit($visit) 
{ 
 $curyear = date(&#39;Y&#39;); 
 $visit_list = []; 
 foreach ($visit as $v) { 
  if ($curyear == date(&#39;Y&#39;, $v[&#39;visittime&#39;])) { 
   $date = date(&#39;m月d日&#39;, $v[&#39;visittime&#39;]); 
  } else { 
   $date = date(&#39;Y年m月d日&#39;, $v[&#39;visittime&#39;]); 
  } 
  $visit_list[$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：

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"
 } 
 } 
}

Salin selepas log masuk

对的，这正是我想要的效果。