回答編集履歴
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answer
CHANGED
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@@ -4,4 +4,64 @@
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4
4
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aかbか''のどれかでしょうか？aとbの両方にカテゴライズされることはないのですか？
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5
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6
6
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いずれにしろ、テーブルとかんたんなサンプルを表記し、
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7
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期待する結果を提示していただいたほうが適切な回答がつきやすいと思います
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7
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期待する結果を提示していただいたほうが適切な回答がつきやすいと思います
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8
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# sample
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10
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```SQL
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11
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create table wp_posts(ID bigint(20) unsigned not null primary key auto_increment,post_date datetime);
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insert into wp_posts values(1,'2016-01-01 00:00:00'),(2,'2016-01-01 01:00:00'),(3,'2016-01-02 00:00:00'),(4,'2016-02-01 00:00:00'),(5,'2016-02-01 01:00:00'),(6,'2016-03-01 00:00:00'),(7,'2017-01-01 00:00:00');
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```
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15
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だったとして、抽出するSQLは
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16
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```SQL
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select year(post_date) as year
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,month(post_date) as month
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,count(*) as count
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20
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from wp_posts
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group by year,month
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order by year desc,month desc;
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```
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すると結果は
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```ここに言語を入力
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year month count
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2017 1 1
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2016 3 1
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2016 2 2
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2016 1 3
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```
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なり、PHPでいうとこんな感じ
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```ここに言語を入力
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/*抽出部分は省略*/
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$months=[
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(object) ["year"=>2017,"month"=>1,"count"=>1],
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(object) ["year"=>2016,"month"=>3,"count"=>1],
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(object) ["year"=>2016,"month"=>2,"count"=>2],
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(object) ["year"=>2016,"month"=>1,"count"=>3],
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];
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$html="";
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$pre_year=0;
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foreach($months as $key=>$month){
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$year=$month->year;
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if($pre_year!==$year){
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if($key>0){
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$html.="</ul>\n";
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$html.="</div>\n";
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}
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$html.="<div>\n";
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$html.=sprintf("<h4>%s年</h4>\n",$year);
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$html.="<ul>\n";
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}
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$html.=sprintf("<a href='#'>%s月(%s)</a></li>\n",$month->month,$month->count);
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$pre_year=$year;
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}
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if(count($months)>0){
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$html.="</ul>\n";
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$html.="</div>\n";
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}
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print "<pre>\n";
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print htmlspecialchars($html);
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print "</pre>\n";
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```
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