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password_get_info

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

password_get_info指定したハッシュに関する情報を返す

説明

password_get_info(string $hash): array

password_hash() がサポートするアルゴリズムで生成した有効なハッシュを渡すと、 そのハッシュに関する情報の配列を返します。

パラメータ

hash

password_hash() が作ったハッシュ。

戻り値

三つの要素を持つ連想配列を返します。

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User Contributed Notes 1 note

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cbungholio at gmail dot com
7 years ago
If you're curious to use this method to determine if there is someway to evaluate if a given string is NOT a password_hash() value...

<?php

// Our password.. the kind of thing and idiot would have on his luggage:
$password_plaintext = "12345";

// Hash it up, fuzzball!
$password_hash = password_hash( $password_plaintext, PASSWORD_DEFAULT, [ 'cost' => 11 ] );

// What do we get?
print_r( password_get_info( $password_hash ) );

/* returns:
Array (
[algo] => 1
[algoName] => bcrypt // Your server's default.
[options] => Array ( [cost] => 11 )
)
*/

// What about if it's un-hashed?...
print_r( password_get_info( $password_plaintext ) );

/* returns:
Array (
[algo] => 0
[algoName] => unknown
[options] => Array ( )
)
*/
?>

... Looks like it's up to each of us to personally decide if it's safe to compare against the final returned array.
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