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password_get_info

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

password_get_infoReturns information about the given hash

Description

password_get_info(string $hash): array

When passed in a valid hash created by an algorithm supported by password_hash(), this function will return an array of information about that hash.

Parameters

hash

A hash created by password_hash().

Return Values

Returns an associative array with three elements:

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User Contributed Notes 2 notes

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9
cbungholio at gmail dot com
6 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.
up
-41
lincoln dot du dot j at gmail dot com
6 years ago
<?php

$a
= password_hash("rasmuslerdorf", PASSWORD_DEFAULT);

var_dump(password_get_info($a));
//change every refresh
var_dump($a);

?>

//Output like

array(3) {
["algo"]=>
int(1)
["algoName"]=>
string(6) "bcrypt"
["options"]=>
array(1) {
["cost"]=>
int(10)
}
}
string(60) "$2y$10$wKEZs6W//QDoOeTKSCXx7.Y9Q7duFEtJpFFuJn1G5GhyWTTit/tL2"
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