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derive, derivationは「派生させる、派生」「導き出す、導出」のいずれの意味もありますが、PBKDF2の文脈では「導出」とするのが比較的一般的なようです(かつ、日本語としてもしっくり来ると思います)。
参考:https://ja.wikipedia.org/wiki/PBKDF2
また英語版と見比べていて、
$length = 0
の場合の説明がすっぽり抜けていることに気付いたので合わせて追加を行っています。https://github.com/php/doc-en/blob/e0352653179c355a6b9c353629147b06a2069f24/reference/hash/functions/hash-pbkdf2.xml#L75-L78