March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
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216
10
章 ユーザの記憶：クッキーとセッション
}
}
return array($errors, $input);
}
password_hash()
と
password_verify()
はパスワードが十分安全な方法でハッシュ化されている
ことを保証し、必要に応じて将来このハッシュを強化できるようにしてくれます。これらの関数
の機能について詳しく知りたければ、オンライン PHP マニュアルの
password_hash
と
password_
verify
のページを読むか、David Sklar と Adam Trachtenberg 共著の『PHP Cookbook, 3rd
Edition』（O
’
Reilly Media、2014 年。和書未刊）のレシピ 18.7 を参照してください。
password_hash()
関数と
password_verify()
関数は、
PHP 5.5.0
以降で利用できる。それ
以前のバージョンの
PHP
を使っている場合には、
password_compat
ライブラリを使う。
上記の例では、
validate_form()
内にユーザとパスワードの配列を入れているため自己完結型に
なっています。しかし、ユーザ名とパスワードをデータベーステーブルに格納する方が一般的で
す。例 10-18 は、データベースからユーザ名とハッシュ化したパスワードを取得するバージョンの
validate_form()
です。データベース接続はすでに関数外で確立されており、グローバル変数
$db
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