Gets the cipher key length
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    openssl_cipher_key_length

    (PHP 8 >= 8.2.0)

    openssl_cipher_key_length — Gets the cipher key length

    Description

    openssl_cipher_key_length(string $cipher_algo): int|false

    Gets the cipher key length.

    Parameters

    cipher_algo

    The cipher method, see openssl_get_cipher_methods() for a list of potential values.

    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:

    int(16)