質問編集履歴
1
あ
test
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File without changes
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test
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@@ -10,11 +10,7 @@
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10
10
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11
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```URL
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-
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https://www.php.net/manual/ja/language.oop5.variance.php
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[リンク:(PHPリファレンス - 共変性と反変性)](https://www.php.net/manual/ja/language.oop5.variance.php)
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16
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-
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```
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16
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