If a newer API is backwards-compatible, always define every possible API version in order to prevent older installer versions from giving up.〔【出典】PEAR ◆【License】Open Publication License ◆【編集】独立行政法人情報通信研究機構 〕
新しいバージョンをインストールする前に旧バージョンを削除する
remove the previous version before installing the newer version
In other words, if the child package contains the same files as any earlier version of the parent package, the child package would normally conflict with the parent package because it would be attempting to overwrite the parent package's files with its own files.〔【出典】PEAR ◆【License】Open Publication License ◆【編集】独立行政法人情報通信研究機構 〕