回答編集履歴
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はいはい
test
CHANGED
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@@ -1 +1,17 @@
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[array_seach](http://php.net/manual/ja/function.array-search.php)でキー(何番目か)が分かるので、+1,-1すればいいのでは？
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2
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3
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5
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```php
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6
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+
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7
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$pos = array_search($this_id, $post_id_index, true);
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8
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9
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$prev_pos = $pos - 1;
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10
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11
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$next_pos = $pos + 1;
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12
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if($prev_pos < 0) $prev_pos = null;
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14
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15
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if($next_pos >= count($post_id_index)) $next_pos = null;
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16
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17
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```
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