回答編集履歴
2
改善
test
CHANGED
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@@ -40,11 +40,13 @@
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40
40
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41
41
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$chars = explode(',', $str);
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42
42
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43
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+
$last = array_pop($chars);
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44
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+
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43
45
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$root = [];
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44
46
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45
47
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$current = &$root;
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46
48
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47
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-
foreach (
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49
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+
foreach ($chars as $char) {
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48
50
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49
51
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$current[$char] = [];
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50
52
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@@ -52,11 +54,7 @@
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52
54
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53
55
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}
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54
56
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55
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-
foreach (array_slice($chars, -1) as $char) {
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56
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-
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57
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-
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57
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+
$current = $last;
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58
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-
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59
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-
}
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60
58
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61
59
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unset($current);
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62
60
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1
追記
test
CHANGED
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@@ -1,3 +1,7 @@
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1
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# 全てキーに格納する場合
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2
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3
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4
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+
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1
5
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```php
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2
6
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3
7
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<?php
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@@ -21,3 +25,45 @@
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21
25
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print_r($root);
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22
26
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23
27
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```
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28
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+
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29
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+
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30
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31
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# 最後だけその前のキーの値に格納する場合
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32
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+
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33
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34
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35
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```php
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36
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37
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<?php
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38
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39
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$str = 'あ,い,う,え,お';
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40
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41
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$chars = explode(',', $str);
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42
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43
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$root = [];
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44
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+
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45
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$current = &$root;
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46
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+
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47
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foreach (array_slice($chars, 0, -1) as $char) {
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48
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49
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$current[$char] = [];
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50
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51
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$current = &$current[$char];
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52
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53
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}
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54
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55
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foreach (array_slice($chars, -1) as $char) {
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56
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+
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57
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$current = $char;
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58
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+
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59
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}
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60
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+
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61
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unset($current);
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62
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63
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print_r($root);
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64
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65
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```
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66
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67
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+
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68
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+
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69
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+
ただし，後者のようなデータ構造は設計が破綻しているので，前者を採用することをおすすめします．一貫性がありません．
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