(PHP 8 >= 8.2.0)
openssl_cipher_key_length — Gets the cipher key length
openssl_cipher_key_length(string $cipher_algo): int|false
Gets the cipher key length.
cipher_algoThe cipher method, see openssl_get_cipher_methods() for a list of potential values.
Returns the cipher length on success, or false on failure.
Emits an E_WARNING level error when the cipher algorithm is unknown.
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:
int(16)
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https://www.php.net/manual/en/function.openssl-cipher-key-length.php