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PHP - Manual: crypt_gensalt - 互联网笔记

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PHP - Manual: crypt_gensalt

2025-06-03

crypt_gensalt

(PECL xpass >= 1.1.0)

crypt_gensaltCompile a string for use as the salt argument to crypt

说明

crypt_gensalt(string $prefix = null, int $count = 0): ?string

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

参数

prefix
Hashing method. One of the CRYPT_PREFIX_* constant. If null, the best available hashing method will be selected.
count
Controls the processing cost of the hash; the valid range and exact meaning of count depend on the hashing method, but larger numbers correspond to more costly hashes in terms of CPU time and possibly memory usage. If count is 0, a low default cost will be selected.

返回值

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

示例

示例 #1 A crypt_gensalt() example

<?php
// Generate the salt
$salt = crypt_gensalt(CRYPT_PREFIX_BLOWFISH);
// Hash the password
$hash = crypt("secret", $salt);
// Check the hash
$test = hash_equals(crypt("secret", $hash), $hash);
var_dump($salt, $hash, $test);
?>

以上示例会输出:

string(29) "$2y$05$GcPykP.Am8C1.dGamdpwW."
string(60) "$2y$05$GcPykP.Am8C1.dGamdpwW.1RR.7uicWvJPZfJfCEizZHqVWwuaJLm"
bool(true)

参见

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官方地址:https://www.php.net/manual/en/function.crypt-gensalt.php

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