PHP 5 >= 5.3.3, PHP 7, PHP 8
openssl_cipher_iv_length - Gets the cipher iv length
Code Examples

openssl_cipher_iv_length( string$cipher_algo ): int|false

Gets the cipher initialization vector (iv) length.



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.

Exceptions and Errors

Emits an E_WARNING level error when the cipher algorithm is unknown.

Example of openssl_cipher_iv_length

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PHP Version:

Function openssl_cipher_iv_length:

OpenSSL Functions

Most used PHP functions