Validate a crypt setting string

# crypt_checksalt

(PECL xpass >= 1.1.0)

crypt_checksalt — Validate a crypt setting string

### 説明

function crypt_checksalt(string `$salt`): ?string

Checks the salt string against the system configuration and reports whether the hashing method and parameters it specifies are acceptable. It is intended to be used to determine whether the user's passphrase should be re-hashed using the currently preferred hashing method.

### パラメータ

`salt`
  Salt string to check.

### 戻り値

Returns one of the `CRYPT_SALT_*` as an int.

### 例

例1 A crypt_checksalt() example

    <?php
    // Generate a salt for a legacy method
    $salt = crypt_gensalt(CRYPT_PREFIX_STD_DES);
    // Check the salt
    $test = crypt_checksalt($salt);
    var_dump($test === CRYPT_SALT_METHOD_LEGACY);

    // Generate a salt for default method
    $salt = crypt_gensalt();
    // Check the salt
    $test = crypt_checksalt($salt);
    var_dump($test === CRYPT_SALT_OK);
    ?>

上の例の出力は以下となります。

    bool(true)
    bool(true)

### 参考

- crypt_gensalt() - Compile a string for use as the salt argument to crypt

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