Hash password using PHP function 'password_hash'

Use PHP function "password_hash" to hash password

Password is a very important thing in our lives, especially in the modern Internet era, protecting the security of user passwords is particularly important. In PHP development, we can use the function "password_hash" to hash passwords to improve password security. This article will introduce how to use the "password_hash" function and provide corresponding code examples.

The hash function is a method of converting input into a fixed-length string. This process is irreversible, that is, the original input cannot be restored from the hash value. By hashing passwords, even if the database is compromised, attackers cannot simply obtain user passwords.

In PHP, we can use the "password_hash" function to perform password hashing. This function accepts two parameters: the first parameter is the password to be hashed, and the second parameter is the type of hashing algorithm.

Here is a sample code that illustrates how to use the "password_hash" function to hash passwords:

$password = "myPassword";

// 使用默认的 bcrypt 算法进行哈希处理
$hashedPassword = password_hash($password, PASSWORD_DEFAULT);

// 存储哈希后的密码到数据库
// ...

// 验证用户输入的密码是否正确
if (password_verify($inputPassword, $hashedPassword)) {
    echo "密码匹配";
} else {
    echo "密码不匹配";
}

In the above code sample, we first define a variable $password Store the original password. We then hash the password by calling the password_hash function and store the result into the $hashedPassword variable. Next, we store the hashed password in the database, the specific implementation details are omitted here.

When a user logs in, we can verify whether the password entered by the user matches the hashed password stored in the database by calling the password_verify function. If there is a match, output "Password Matches", otherwise output "Password Does Not Match".

It should be noted that the first parameter of the password_verify function is the password entered by the user, and the second parameter is the hashed password stored in the database. This function automatically compares the entered password and the hashed password to see if they are consistent, and returns a Boolean value.

It is worth noting that when using the password_hash function for password hashing, PHP will automatically generate a unique salt value for each password, and this salt value will be stored together with the password. Hash passwords to increase password security.

When using the "password_hash" function for password hashing, we do not need to manually add salt, nor do we need to care about the specific implementation of salting. PHP will automatically complete these tasks to ensure the security of the password. .

In short, using the PHP function "password_hash" for password hashing can improve password security and prevent user passwords from being leaked. We should give top priority to password security and actively adopt appropriate methods to protect users' password information.

The above is an introduction to using the PHP function "password_hash" to hash passwords. I hope it will be helpful to you.

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