(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_secretbox_keygen — Generate random key for sodium_crypto_secretbox
Generate a key for use with sodium_crypto_secretbox() and sodium_crypto_secretbox_open().
此函数没有参数。
Returns the generated string of cryptographically secure random bytes.
示例 #1 sodium_crypto_secretbox_keygen() example
<?php
$key = sodium_crypto_secretbox_keygen();
var_dump( sodium_bin2hex( $key ) );
?>以上示例的输出类似于：
string(64) "88bd1dc51ec81984f3ddc5a8f59a3d95b647e2da3e879f1b9ceb0abd89e7286c"
示例 #2 Comparing sodium_crypto_secretbox_keygen() with random_bytes()
<?php
$key = sodium_crypto_secretbox_keygen();
$bytes = random_bytes( SODIUM_CRYPTO_SECRETBOX_KEYBYTES );
var_dump( mb_strlen( $key, '8bit' ) === mb_strlen( $bytes, '8bit' ) );
?>以上示例会输出：
bool(true)