How to classify data according to week in TP

The followingthinkphp frameworkThe tutorial column will introduce to you how to classify data by week. I hope it will be helpful to friends in need!

Detailed description of the problem:

The problem of classifying data by week:

I now have a data, which is calculated based on tp per day. Corresponding The data is

["2011-1-1","2011-1-2","2011-1-3","2011-1-4",...]

The data corresponding to each day (tp)

[1,2,2,3,...]

Now let’s talk about classifying these dates by week, and the calculated result is

["2011年第一周",...]

The data is

[8,...]

So what should we do now? It doesn’t matter what language is used to implement it~~~~

Implementation method:

<?php
$date_list     = null;
$num_list     = null;
$index = 0;
while($index < 20) {
    $date_list[] = date(&#39;Y-m-d&#39;,strtotime(&#39;-&#39; . $index . &#39; day&#39;));
    $num_list[] = $index;
    $index++;
}

// 先别管上面的代码，只是为了生成你的数据
$ret_list = null;
// 假设日期数组和值数组的索引一致
foreach($date_list as $k => $date) {
    if($ret_list[date(&#39;W&#39;, strtotime($date))]) {
        $ret_list[date(&#39;W&#39;, strtotime($date))] += $num_list[$k];
    } else {
        $ret_list[date(&#39;W&#39;, strtotime($date))] = $num_list[$k];
    }
}
echo("日期数组：<br/>");
print_r($date_list);
echo("<br/>");

echo("数值数组：<br/>");
print_r($num_list);
echo("<br/>");

echo("按周统计数组（数组的键就是今年的第几周）：<br/>");
print_r($ret_list);

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