PHP - password_get_info() 函式

PHP 雜湊password_get_info()函式用於檢索給定雜湊的資訊。返回的資訊將採用陣列格式。

返回的陣列包含三個元素“algo”、“algoName”和“options”，如下所述：

• algo - 這是一個整數，表示用於建立雜湊的演算法，它與一個密碼演算法常量匹配。
• algoName - 這是一個人類可讀的字串，描述用於雜湊密碼的演算法。
• options - 這包括呼叫password_hash()函式時提供的任何選項，例如成本引數或其他特定於演算法的設定。

語法

以下是PHP 雜湊password_get_info()函式的語法：

password_get_info(string $hash): array

引數

此函式接受一個名為“hash”的引數，如下所述：

• hash - 由password_hash()函式建立的雜湊。

返回值

此函式返回有關給定雜湊的資訊。

示例1

以下程式演示了PHP 雜湊password_get_info()函式的用法：

<?php
   #password
   $passw01 = "53nh46u74m3nt3";
   $hashp01 = password_hash($passw01, PASSWORD_ARGON2ID);
   echo "The given password: $passw01";
   echo "\nPassword length: ".strlen($passw01);
   echo "\nThe hash is: ".$hashp01;
   echo "\nHash length: ".strlen($hashp01);

   $hashi01 = password_get_info($hashp01);
   echo "\nThe information about hash: ";
   echo "\n".$hashi01["algo"];
   echo "\n".$hashi01["algoName"];
   echo "\n".$hashi01["options"]["memory_cost"];
?>

輸出

上述程式產生以下輸出：

The given password: 53nh46u74m3nt3
Password length: 14
The hash is: $argon2id$v=19$m=65536,t=4,p=1$d1lQNFRXaHZ4c2svckVwSw$ycYE/MWu3Rc1oRa8VWV3ZqNS8i0QqWnnuWdQzjwsAZQ
Hash length: 97
The information about hash:
argon2id
argon2id
65536

示例2

以下是PHP 雜湊password_get_info()函式的另一個示例。我們使用此函式來檢索有關給定雜湊的資訊：

<?php
   $passw02 = "53nh46u74m3nt3"; 
   $opts02 = [ "memory_cost" => 512, "time_cost" => 3, "threads" => 3 ]; 
   $hashp02 = password_hash($passw02, PASSWORD_ARGON2ID, $opts02); 
   echo "The given password: ".$passw02;
   echo "\nThe password length: ".strlen($passw02);
   echo "\nHash: ".$hashp02;
   echo "\nHash length: ".strlen($hashp02);
   $hashi02 = password_get_info($hashp02);
   echo "\nAn information about hash: ";
   echo "\nAlgo: ".$hashi02["algo"];
   echo "\nAlgo Name: ".$hashi02["algoName"];
   echo "\nMemory cost: ".$hashi02["options"]["memory_cost"];
   echo "\nTime cost: ".$hashi02["options"]["time_cost"];
   echo "\nThreads: ".$hashi02["options"]["threads"];
?>

輸出

執行上述程式後，將顯示以下輸出：

The given password: 53nh46u74m3nt3
The password length: 14
Hash: $argon2id$v=19$m=512,t=3,p=3$SC4yMWZ0TUIxaTJ3TnVBYQ$JCztOuIo34OX0OEmtHzSnKLN/Zugk5buGm0k/tTFpbs
Hash length: 95
An information about hash:
Algo: argon2id
Algo Name: argon2id
Memory cost: 512
Time cost: 3
Threads: 3