回答編集履歴
1
方針転換
answer
CHANGED
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@@ -1,1 +1,10 @@
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1
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+
```php
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2
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+
$levels = [1, 2, 3, 4, 5, 101, 102, 103, 104, 105, ...];
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3
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+
$found = -1;
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4
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for ($i = 0; $i < count($levels); $i++)
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1
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-
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5
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if ($levels[$i] == $levelID) {
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6
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$found = $i; break;
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7
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}
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8
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$minLevel = $levels[$found>=2 ? $found-2 : 0];
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9
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$maxLevel = $levels[$found+2 >= count($levels) ? count($levels) : $found+2];
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10
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+
```
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