Get the prefix of the preferred hash method

# crypt_preferred_method

(PECL xpass >= 1.1.0)

crypt_preferred_method — Get the prefix of the preferred hash method

### 说明

function crypt_preferred_method(): ?string

Get the prefix of the preferred hash method.

### 参数

此函数没有参数。

### 返回值

Returns a string with the prefix, or `null` in case of an error.

### 示例

示例 #1 A crypt_preferred_method() example

    <?php
    var_dump(crypt_preferred_method());
    ?>

以上示例会输出：

    string(3) "$y$"

### 参见

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

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