PHP: openssl_cipher_key_length - Manual
(PHP 8 >= 8.2.0)
openssl_cipher_key_length — Gets the cipher key length
Description
function openssl_cipher_key_length(string $cipher_algo): int|false
Gets the cipher key length.
Return Values
Returns the cipher length on success, or false on failure.
Errors/Exceptions
Emits an E_WARNING level error when the cipher algorithm
is unknown.
Examples
Example #1 openssl_cipher_key_length() example
<?php
$method = 'AES-128-CBC';var_dump(openssl_cipher_key_length($method));
?>
The above example will output something similar to: