回答編集履歴
1
niji
answer
CHANGED
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@@ -17,4 +17,39 @@
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17
17
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["A","B","C","D","E","F","G","A","B","D","F","A","B","D","B","B","B"]
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18
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が返る
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19
19
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*/
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20
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+
```
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21
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+
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22
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# 二次配列の場合
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23
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二次配列でも考え方は同じ
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24
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```PHP
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25
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<?PHP
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26
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$a=[
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27
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['id' => '2' ,'category_id' => 'A',],
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28
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['id' => '30' ,'category_id' => 'A',],
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29
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['id' => '12' ,'category_id' => 'B',],
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30
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['id' => '8' ,'category_id' => 'B',],
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31
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['id' => '10' ,'category_id' => 'C',],
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32
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['id' => '329' ,'category_id' => 'D',],
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33
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['id' => '89' ,'category_id' => 'E',],
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34
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['id' => '79' ,'category_id' => 'E',],
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35
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['id' => '58' ,'category_id' => 'A',],
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36
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['id' => '219' ,'category_id' => 'B',],
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37
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['id' => '44' ,'category_id' => 'B',],
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38
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['id' => '3219' ,'category_id' => 'B',],
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39
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['id' => '231' ,'category_id' => 'B',],
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40
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['id' => '43210','category_id' => 'F',],
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41
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];
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42
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$b=[];
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43
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$c=[];
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44
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while(count($a)>0){
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45
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//shuffle($a);
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46
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$category=isset($c["category_id"])?$c["category_id"]:null;
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47
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$a=array_merge(array_filter($a,function($x) use($category){
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48
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return $x["category_id"]!=$category;
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49
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}),array_filter($a,function($x) use($category){
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50
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return $x["category_id"]==$category;
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51
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}));
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52
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$b[]=($c=array_splice($a,0,1)[0]);
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53
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}
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54
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print json_encode($b);
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20
55
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```
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