PHP 8 deprecates openssl_free_key (actually openssl_pkey_free which it aliases) and automatically destroys the key instance when it goes out of scope.
PHP - Manual: openssl_pkey_free
2024-11-13
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
openssl_pkey_free — 释放一个私钥
key
持有该密钥的资源。
没有返回值。
PHP 8 deprecates openssl_free_key (actually openssl_pkey_free which it aliases) and automatically destroys the key instance when it goes out of scope.
官方地址:https://www.php.net/manual/en/function.openssl-pkey-free.php